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 20, 2007

For def

the thing thats the best or is really good

that dinner was for def.

by Lawl Thomes January 14, 2008

Hi-Def

A polite way of greeting a hearing impaired individual.

"Look, there comes old Mrs. Danielson. The poor thing just can't hear anything anymore. Hi-Def!"

"That filthy old man has been sitting on the street for so long that his darn ears have done rotted plumb off. Hi-Def!"

"Hey that's Pete Townsend over there, isn't it? Hi-Def!"

by www.babysue.com January 2, 2009

mos def

a fly MC, often apperaring alongside Talib Kweli, The Roots, or Common

mos def is one ill nigga, son

by Ponyboy August 3, 2003

mos def

Slang for 'most definitely'

"Wan' a cig, man? "Mos' def!"

by David Allison August 21, 2003

mos def

A man who can not only act with 5 star ability, but can also create some of the best shit out on recording ever.

Mos Def yet an actor of decent fame still keeps his hip-hop true.

by Paul October 2, 2003

Def Leppard

80's hard rock quintet, famous for there one armed drummer, creative guitar riffs, one armed drummer, and lead singer, Joe Elliott's Mullet

"I'm hot sticky sweet from my head to my feet, yeah!!!"

by Slang625 May 21, 2003