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.
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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.
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To deficate from and elevated position
the public toilets where so bad i had to take a high def.
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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
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(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."
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tyler: Did it feel the best when i put it in your butt last night?
zane: mos def!
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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
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