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A clever combination of showering and pissing. It is very widely known and used among males, usually the type of guys that want to save time.(p.s. not to be confused with showhistling)
dude 1:"hey man when are you finishing?"
dude 2:"sorry bro this might take a while, right now i'm showering, and then i gotta piss as well!"
dude 1:"since you are already showering, why are you not showissing?"
by Bull0cks July 01, 2014
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