Mos Def comes from two words, mos is short slang for "most" and def is short for "deft" which means skilled. Thus "mos def" is defined as "most skilled."
Mos Def is also a rap alias for one Dante Smith.
by RTK666 December 28, 2004
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abrieveation of im a deaf old dear
"ima steal your wallet", "she can't hear you dude, she's mos def"
by bencΓ© December 15, 2004
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