When a man has an intense need to pee, but cannot do so, and and erection occurs. Usually a painful experience, can also be done intentionally to prevent make it easier to "hold it in".
Liam- "Holy crap do I have a peerection right now. This is painful."
Kevin- " Maybe next time don't drink three gatorades, a Big Gulp and a massive coffee before we get on a bus for three hours. Dumb ass."
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