- ivory
- jack
- jake
- jaloppy
- jalopy
- jam
- jane
- jerk
- jittery
- jive
- job
- joe
- kale
- keen
- kerb market
- kerb-stone
- kiddy
- jerry
- jink
- jitters
- joint
- joker
- jolly
- josh
- joy-ride
- joystick
- judy
- jug
- juggins
- juice
- junk
- kail
- kangaroo
- kaput
- kick
- killick
- killock
- kinchin
- kisser
- kite
- kite-flying
- knobstick
- keelhaul
- kennel ration
- khyber
- kibosh
- kid
- kingdom-come
- kip
- kipper
- kiwi
- kudos
- knob
- knock
- knock-out
- knocker
- kook
- kookie
- kvetch
- laid
- lairy
- lam
- lamp
- lather
- lardy-dardy
- lashing
- lay
- left
- lemon
- lead
- leading light
- leather
- leather-neck
- let
- letch
- lick
- leather-head
- leery
- leg
- lid
- lifer
- light
- lingo
- lit up
- lip
- lizzie
- load
- loaf
- loaves
- loco
- liquor
- lolly
- look-see
- loony
- loony-bin
- looped
- loopy
- loot
- long greens
- long tom