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It means like terrific or great or excellent
"I bet you were def." ~Fresh Prince Of Bel Air when he's talking to Ashley about her singing. 1st episode
def by Lady_Rae_Marie January 11, 2006
Related Words
Def ain't short for Deffinitly.

Def means cool, ill, dope. You know.
def by some polak September 17, 2004
Can be short for definitely or definition. It can also be used to emphasize a word such as something is really cool or really not cool, etc.

(orgin well the celtic swim '06-07 team can take credit i guess)
Gouge Vomit Burn is the def. of sick nasty. (definition) That's def going to happen. (definitely) Are we going to have a dance party later? Yeah def!
def by Celtic Swim '06-07 December 14, 2008
1. short for definitely
2. short for definition
3. death, misspelled
4. record label Def Jam
5. deaf, misspelled

and most importantly:
6. HOT, COOL, GREAT!!
That song is def man!!
def by SyntaxE July 17, 2006
I always mispell the word definitely, so its easier to text def, than spend 5 minutes trying to fix the messed up word I get from T9 on my cell phone.
def by caffeinequeen November 8, 2007
Don’t try to fool your girlfriend because it can turn into a DEF. Dumb Epic Fail
DEF
DEF by Solarsilicon October 22, 2017