l33tsp33k
A "dialect" of english that uses symbols/numbers/etc. in place of letters. used by people who think they are "1337 |-|4><0RZ", but are really just morons trying to be cool. They also mis-define the word hack, which _REALLY_ means "to program".

Comes from "Elite Speak"

Bytehway: it really is not cool to use this, just type normally.
Moron: ! 4/\/\ 4 1337 |-|4><0R, |)00|)!
Me: ...moron...