The massive member between a black mans legs.
The black man had the power of the horse between his legs.
by Anonymous July 16, 2003
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Also, can be used to refer some ass-hole that really pisses you off.
"Oh GOD! That Motherfucker has got to be the UltraCock of Dickheads!"
Or, "That UltraCock is gonna get his ass kicked one day. By me!".
by Rocknman March 18, 2004
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