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After holding in a piss for a long time, once it is released it feels like a mini orgasam. Also noted the hand on the wall or the closed eyes with grunting are common signs of a pissgasam.
"After that 64 ounce Mountain Dew during the 4 hour car drive, once i was able to drain my lizard i had a major pissgasam."
by Anonymous April 14, 2003