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When you are inebriated. During urination you misjudge the duration of piss and try to flush accordingly, misjudging and pissing much longer.
Guy 1: Dude, why didn't you flush the toilet?
Guy 2: I did...shit I must have miss-piss. Are you over it?
by marc courtmanch March 12, 2009

Words related to miss-piss

bananna drunk miss piss toilet