La: I say, young man. Also: my friend, mon vieux; the feminine equivalent of this word here is "sis."
Sources:LS1, Shaw ST

lace, to: to lash, beat, or thrash someone or something
Source: OED, SL

Lady Muck of Muck Hall: a woman who puts on airs, has a condescending manner and is regarded as excessively conceited.
Source: LS2

Lady de Blobswitch ( comparatively rare): a woman who puts on airs
Source: LS2

Laffin' bags, to be: to be satisfied, happy, with no worries, in luck
Sources:  ST, GS

Lag: to urinate
Source: LS3

Lag: jailbird.  See "sheila" on this list.
Source:  ML

Lal. Harry.
Source: LS1

lamp, to:  to "brain" someone, perhaps by putting their head into sudden contact with a lamp post
Source: SL

Lampin. De Quare feller's lampin. The stranger is watching.
Source: LS1

Lanny. De Lanny. The floating landing stage at the Pier Head.
Source: LS1, SL

lap of honor, to do: a victory parade or strut, after a successful race
Source: BLH

Larriken(Australian): a street rowdy
Source: OED

lascar rope(obsolete): cheap lodging house "He was a foulmouthed little b.... as much at home in a lascar rope as a child or rich folk might have been in his nursery."  For a very small amount, individuals, many of them drunken seamen, could stand half draped over a rope and get what sleep they could. See "lascars" on this list.
Source: A

Lascars, sometimes spelled lasker(obsolete): originally thie meant East Indian sailors, who were known on ships as stokers from the hot seas. Some referred to them as smoked Irishmen.
Sources: SL, OED, IHBY, TIM

Lash-up: controversy
Source:  ML

Lashins: plenty of.  A full mean is one with "lashins" of food and drink.
Sources: Shaw ST, Moloney

Lassy bands: rubber bands or elastic strings
Source: SL

Last back-end: the latter part of the previous year.  The phrase "back-end" refers to the fall.
Source: LS2

Last Supper, Ther: sardonic name for fish and chips
Source: LS2

Latchlifter. De latchlifter: The price of a half-a-pint of beer. Spiegl notes that this is the minimum sum of money required to gain entrance to a public house, in the hope that further drinks will be bought by others.
Source: LS1

Lauder, 'Arry, to give(rhyming): to give order and quiet down
Source: ML

Launching Pad, the: Protestant phrase for the Catholic Cathedral in Liverpool. See also Paddy's Wigwam and the Mersey Funnel.
Source: SL

lay the table, to: to set the table
Source: SL

laying out: on payday the housewife would put the money due on top of each collection book
Source: SL

Lazzie and ups: variant of marbles game.
Source: LS1

leather a child, to:  to punish with a strap
Source: LWAT

leb gold: cannabis resin in block form
Source: LS4

lecky railway, de: The Mersey Underground Railway
Source: LS1

Lecky man. De lecky man. The electric meter reader.
Source: LS1

Left tit(rhyming): another name for threepence, or threepenny bit
Source: SL

Left-footer. A Catholic. In Northern Ireland, the inquiry as to which foot you dig with is really an attempt to find out whether you are Catholic or Protestant. The belief is that Catholics dig with the left foot, Protestants with the right.  According to Terry Eagleton, two different kinds of spade were traditionally used in Ireland, one in (mainly Catholic) Munster and Connacht, and the other in (partly Protestant) Ulster.  One spade was notched on the right side for digging, the other notched on the left.  But actually the Catholic spade was notched on the right, the Protestant one on the right.  Folklore prevailed:  the Catholic "Other" had to be consigned to the left; calling them "right" would have involved dangerous ironies.
Source: LS1, TAI

left-handed: Catholic.  Cf."left-footer."
source: SL

left standing on four bricks, to be: to be a sexually aroused male, hopes and everything else up, and then suddenly rejected or abandoned.
Ssource: SL

Leg over, getting a leg: having a sexual tryst
Source: SL

Leg it: to get away quickly
Source: SL

Legless: extremely intoxicated
Source: LS4

Lemmin pelter, a (lemon pelter): member of the Loyal Order of the Orange Lodge
Source: LS3

Lemonjitis: being partial to a wedge of lemon with Friday fish
Source: LS3

lett'ns: a Corporation housing department. Source: "lettings," an office where living accommodation is let.
Source: LS2

Lezzy: a lesbian woman
Source: LS2

liberty bodices: young girls's undergarments.
Source: SL

liberty, a bit of a: taking an unfair advantage, usually in the courting game.
LS3

Lice Palace, Ther: The Lyceum Theatre, Liverpool. Also called the Old Licey
Source: LS2

light o'loves: prostitutes
Source: LMC

Like. Y'know like a much used but meaningless interjection
Source: LS1

limber: artillery caisson
Source: A

limpet: a shelled mollusc which adheres tightly to rocks
Source: SL

Linen: Newspaper
Source: LS3

Lippie: lipstick
Source: SL

liquorice(obsolete) another word for chewing tobacco in bulk form
Source: TIM

Little Man in a Boat, Hotspot: clitoris
Source: LS3

littly, a: a child
Source: SL

livener, a: hair of the dog the morning after a night of drinking
Source: LS3

Liverpool Kiss, a: same as a Kirkby Kiss, which means butting the head of the recipient.
Source: SL

livin'-on merchant: a pimp
Source: SI

Loaf of Bread(rhyming): the head
Also: barnet, bonce
Source: LS3

Lobbo: a thoroughly confused situation. The word can also be an instruction to hand something over.
Source: LS1, Moloney

loblolly: food which bubbles in the boiling as it is being prepared.  In Lancashire, a lob lolly was a person engaged in odd jobs or rough work.
Sources: SL, DS

lock fields(obsolete) wasteland along a canal
Source: GU

Locust beans, sometimes spelled locus beans: carob beans used in the manufacture of cattle-food; considered a delicacy by children
Sources: LS2, LWAS, ML, SL

Lol: believed by some to be an acronym for "laugh out loud," or "lots of love," or perhaps "Loyal Orange Lodge."
Source: SL

Lollipop man: Children's crossing guard. The lollipop man or woman carries a stick surmounted by a disk reading "Stop. Children crossing."
Source: SCHUR, ML

lolly ice: frozen fruit flavored water on a stick
Source: SL

lolly water: soft drink, sometimes colored, usually mentioned by someone who would prefer something stronger
Source: SL, ML

long string o' misery: a person who whines; a perpetual complainer
Source: LS2

long haired one, the: one's wife
Source: SL

long string o' summat-er-other: said of a person who is disliked
Source: LS2

Long One, a: one thousand pounds, also called a grand.
Source: LS1, LS3

looking at the dead: a favorite children's pastime in former years.  Children would arrive at a home in which the body of the deceased was on display and ask to see it.  It was though unlucky to refuse young children entry for that purpose. Often the real attraction was the wake food.
Source: WLAT

Looks. Ed lewks like de unchback a Knotty Ash. He is of grotesque appearance.
Source: LS1

Loop de loop(rhyming): soup
Source: LS1

Loosies: cigarettes sold loose.
Source: LS1

Lord Muck of Muck Hall: a bombastic person; a swollen-headed man who likes to assert his authority.
Source: LS2

Lose a quarter, to(or lose a quart of): to have indigestion (vomiting or diarrhea) after a great deal of drinking.
Source: SHAW II

lotion: yet one more name for an alcoholic beverage
Source: LS3

loud-hailer: electronic speaker frequently used in street meetings
Source: ATHIA

Louse Ladders: sideburns
Source: LS3

ludo: indoor game
Source: WLAT

lug(Lancashire): the ear
Source: GLD, ML

Luggy. A person with one ear.
Source: LS1

Lugole, 'is. His ear.
Source: LS1

Luke Har (mimicking upper class pronunciation): a person regarded as having a precious accent; one who speaks with strained correctness and in a condescending manner.
Source: LS2

lumber, to be in: to be in a catastrophic situation. Lumber can also mean a brawl. In Lancashire, lumber means mischief.
Source: SL, LS3

lump on the scone: a knot on the head from an injury. This usually refers to a child's injury.
Source: SL

lumpers: a lump sum paid as compensation for loss of employment
Source:NYM

Lurk (or lerk): a job, occupation, especially a racket or paying hobby. Spiegl thinks this is a mispronunciation of the Cockney "lark." Moloney suggests that the word is a corruption of "lurch," as in "left in the lurch,"  or abandoned in mid-task.
Sources: LS2,LTB

Lush: drink
Source: LS1

lushed up: drunk
Source: LS1