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The back middle cup of a beer pong rack. Can only occur if the middle row has been eliminated and the front cup is still standing (sometimes referred to as a "Letterman"). However, other cups can become "Spider Cups" if you yell it loud enough.
I couldnt win the beer pong tournament because I just couldnt hit that darn Spider Cup.
by Chris from Gtown August 27, 2008
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