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Fo shiznaps is another way to say "fo sho" or "fo shizzle". REALLY cool kids use this term. Or fuckers who don't want to use "fo shizzle" or "fo sho", which I don't advise using.
Fucker 1: So we gonna get laid tonight?
Fucker 2: Fo shiznaps, foo!
by Joe Paynkis July 19, 2004