fo def.

originaly a typo on aim a combonation between for sure and definatly or def. now it is a word that is ten times better than both of those words

man that movie was of the hook
yeah fo def.

by Kyizzzzie May 1, 2006

Def so

Abreviated slang for 'Definately So': Used mostly by really amazing people i.e. Barack Obama

S: Hey Carrie, don't you just LOVE this shirt on me?
C: Def Not!
S: No Carrie. DEF SO.

by Shatt Ikki January 1, 2009

High Def

To deficate from and elevated position

the public toilets where so bad i had to take a high def.

by Ricardo Botterill September 11, 2007

mos def

a bastardization of most definately
usually used in online lingo

A: hey
B: wuzup
A: n2mh u
A: ssdd
A: wanna see a movie
B: mos def

by cait/eileen January 30, 2003

mos def

(N.) When you reach the maximum of not being able to hear.

"Yo, I don't think that D-Bo heard me. He must be Mos Def now."

by G-Union October 21, 2003

mos def!

short for most definetly!!!!

tyler: Did it feel the best when i put it in your butt last night?

zane: mos def!

by jake1234 April 23, 2006

High Def

The state of being extremely high. Because, your definently high. hence def. Not to be mistaken for high defintion (HD). Although, it is common to be High Def while watching High Def television

After I smoked that blizunt i became elevated to High Def status

by Mr. Logan J C October 6, 2010