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1 definition by KowasakiNinja

When two men who have a common dislike for each other, they will in rare occasions whip out there trusty steeds and do battle.
Ex 1
Jim: I don't enjoy your company
Tim: Then lets penis fight
Ex 2
Tod: Dude you totally just took my girlfriend
Mark: You where not pleasing her anyways
Tod: You douche! Lets penis fight!
by KowasakiNinja June 11, 2010