def /def/ adj. to describe a person, thing, or event that is cool. iarchaic, circa 1981/i
"yo, mah pizzles, I got da hook-up at this def new club. It's suppose ta be off da hizzy"
by Jay January 19, 2003
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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
by Lady_Rae_Marie January 11, 2006
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Def ain't short for Deffinitly.

Def means cool, ill, dope. You know.
Yo man Bone Thugs N Harmony are one of the most def groups of all time.
by some polak September 17, 2004
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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!
by Celtic Swim '06-07 January 28, 2007
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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!!
by SyntaxE July 16, 2006
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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.
by caffeinequeen October 23, 2007
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Short for definately, but often used sarcastically.
(Person A looking at a hot chick)

Person A: I think I have a chance with that babe.

Person B: Def dude.
by Matt0912 May 10, 2009
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