DEF

DEF means that something is really good or to someones standards.

DEF also means not being able to hear anything

DEF does NOT mean definitly

That concert last night was so DEF

Yo Im DEF from that concert last night

by yosoypopichulodelanoche June 12, 2009

def

Def is when you're too lazy or your IQ is too low and you don't know how to properly write the word "Definitely".

So instead of looking uncultured and write shit like "Defenitely" or "Definetly" etc. you Def that shit and save yourself from embracements.

I'm def a retard
I'm def gonna beat my meat after writing this definition.

by Yung Iboprofen June 10, 2017

Def

Origin: " Definate "
" Def " : To strongly concur with a previously made statement.

Wes: Man i'm bored... is your dealer home?

Mike: Def dude :D.

by Wriech June 07, 2007

def

Word commonly used in place of "definetly"...most often heard when in the presence of Julie and Mandie

Julie- Getting drunk later, though?

Mandie- Def.

by Mandie February 19, 2005

def

short for definetly...

"that is most def the best damn thing i ever saw"

by Allison September 24, 2004

def

short for "definatley"

"That is def the ugliest thing I've ever seen."

by Laurie *is hot* April 09, 2005

def

Short for 'defective', which means 'the Ultimate', superlative, better than good...

This started some time after Michael Jackson's "I'm Bad" video, in which 'bad', of course, meant 'good'.

So, to denote a meaning that means the ultimate superlative of 'good', people started using 'defective', which of course is the ultimate superlative of 'bad', and which then was simply abbreviated to 'def'.

Russell Simmons' Def Comedy Jam

by reality_bytes August 16, 2007