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The acronym standing for Newly Initiated Brothers. When one pledge class in a fraternity gets initiated, the NIBs are still at the bottom of the chain for the few weeks until the new pledges begin.
Sam: Why haven't any of the pledge rides answered their phones.
Bob: They're NIBs. They don't give a fuck any more.
Bob: They're NIBs. They don't give a fuck any more.
by NappyBoy February 10, 2013
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A trashy white kid who tries to get alot of Doritos and Mountain Dew to get more Modern Warfare 3 XP
Nibs: Yo mom can we go to wawa to get Doritos!?
Nibs Mom: I just got u Doritos yesterday!
Nibs: The Double XP ran out
Nibs Mom: I just got u Doritos yesterday!
Nibs: The Double XP ran out
by Sqeezz November 14, 2011