look up any word, like bootylicious:
1. def
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 Jan 19, 2003 add a video
2. def
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
3. def
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 Sep 17, 2004 add a video
4. def
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!
5. def
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!!
6. def
Short for definitely.

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.
7. def
Short form of "definitely", as it flows a lot better and can be said much quicker.
Ray: Would you tap that?
Geoff: Def not!
rss and gcal