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The bullshit theory that white people cant play sports, fight, rap, and overall suck. Mostly used by "gangstas" in the "hood". Coined by eminem in his book The Way I Am.
White boy: Yo lemme play ball wit' you guys

Black Boy: Hell no nigga, Crackas' cant play ball

White boy: Fuck you, that's White Men cant jump theory.
by Wade Zabell December 30, 2011