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A game of beer cup with 100 cups, commonly played by frat bros...pantsless. No homo.
"Yo dude, you down for a game of hundocup?"
"Yeah man, it's time to drop trou! Winner parks it in the loser's butt! No homo heh heh"

...the two proceed to play hundocup, then hook up.
by Frat Brosef March 30, 2008
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