Most def

Fosho

That Nigga leeci came up with most def

Alt def 4

you go bye bye now

Alt def 4 gets you kicked from a game

def probs

shorthand for definitely probably - totally badass and an actual word

"def probs" - used standalone
"def probs?" - used as a sentence
"DEF PROBS?" - used as profanity

grab a def

To look up the definition of something.

Hey what does extemporaneous mean?
I don't know let me go grab a def!

imagination def

It is your imagination

I have an brilliant imagination def

Defness

Adjective; a unit of measurement describing the actual level of how def a person is.

Marshall is such an awesome cat, his defness is just unfathomable..