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A disturbing birth defect in which the infant has five penii instead of fingers for his right hand.
1--That kid fucked six chicks at the same time, d00d!
2--How is that possible?
1--He has a pentipenis!
2--Man, that's obvious. I'm fucking dumb.
1--Yeah, you really are.
by Tommy Wommy Womsters October 13, 2003
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