When two dudes try to pee on each other's wiener. The only way to defend yourself against the opponent's piss is to ensure that your pee-force is stronger than their's. The one with the stronger pee force wins.
1: we're going to have a peeVpee tonight. Wanna join?
2: Hell yeah, I've held my pee for an entire day to obliterate anyone who stands in my way.