- lovey-dovery
- light a fire under
- law distrain
- lewdness
- like a Trojan
- leninent
- locker-room
- locus
- louse
- lineaments
- loadsa
- leaving a lot to be desired
- lickety-split
- lighthearted
- little girls' room
- little girls' boys' room
- light fire under
- lay low
- loadsamoney
- lose one's rag
- low-spirited
- like a bag of bones anorexic
- locoweed
- locum tenens
- little boys' room
- ludic
- leave flat
- lame-brained
- lady of the night
- lots
- lick someone's boots
- lonesome
- lassie
- lauded
- long-headed
- larrup
- lippy
- laundered
- let the grass grow under one's feet
- little-bitty
- loose woman
- lamebrained
- like a bear with a sore head
- loo
- lam-brain
- laugh-a-minute
- lead up the garden path
- lowdown
- long-faced
- lubberly
- loads
- lav can
- light out
- lid up
- legless
- locum
- lav
- lamebrain
- lame-brain
- like a cat on a hot tin roof
- lolly
- lady of pleasure
- lo
- loopy
- loony
- l.s.d
- loco
- lashings
- lubber
- like a cat on hot bricks
- loathly
- like a dog with two tails
- lose one's mind
- lummox
- lose one's marbles