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1.
A. Having an illuminating discovery, realization, or disclosure whilst urinating. B. A revealing scene or moment while whizzing.
"Dude, I just figured out that problem I've been working on for weeks!" - Dude 1

"Just now, I thought you were taking a piss?" - Dude 2

"Yeah! I had a pissiphany!" - Dude 1
by Construc June 09, 2010