Top Definition
really a motocross term but now is a word for cool kids only can be used to replace knock-knock in a joke or can be used as a response for anything
if ur name is not kelsey/kylie/momo/kristen/josh...u killed it
NAC NAC
whos there?
jp
jp who?
BONER!!!
by Kelsey aka Hooker June 28, 2006

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