L
- lag
- lamer
- LAN party
- language lawyer
- languages of choice
- LART
- larval stage
- lase
- laser chicken
- leaf site
- leak
- leaky heap
- leapfrog attack
- leech
- leech mode
- legal
- legalese
- lenna
- LER
- LERP
- let the smoke out
- letterbomb
- lexer
- life
- Life is hard
- light pipe
- lightweight
- like kicking dead whales down the beach
- like nailing jelly to a tree
- line 666
- line eater, the
- line noise
- linearithmic
- link farm
- link rot
- link-dead
- lint
- Lintel
- Linus
- Linux
- lion food
- Lions Book
- LISP
- list-bomb
- lithium lick
- little-endian
- live
- live data
- Live Free Or Die!
- livelock
- liveware
- lobotomy
- locals, the
- locked and loaded
- locked up
- logic bomb
- logical
- loop through
- loose bytes
- lord high fixer
- lose
- lose lose
- loser
- losing
- loss
- lossage
- lossy
- lost in the noise
- lost in the underflow
- lots of MIPS but no I/O
- low-bandwidth
- Lubarsky's Law of Cybernetic Entomology
- Lumber Cartel
- lunatic fringe
- lurker
- luser