def

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def

1. slang A shortening of "definitely." Oh yeah, I'll def be there on Friday!
2. slang Outstanding or excellent. Whoa, those sneakers are def—I love them!

mos def

slang Most definitely. A: "You coming to the party later?" B: "Mos def, I'll see you there!"
See also: def

def

(dɛf)
1. mod. better; cool. (Originally black. From definitive.) Man, that yogurt is def!
2. mod. definitely. This is def the best there is.

mos def

mod. most definitely. Am I mad. Mos def!
See also: def