Top Definition
When you want to piss but the damn pee won't come out! Possibly because your urethra is jammed with cum, pussy juice, coke, whatever

Etymology: verb form of constapiss, which is cheaply and crudely derived from the term constipate
Adam: I nearly blew my balls out when I tried to take a piss... I was constipissing!

Lilith: Have you been jamming blow up your urethra again?!

Adam (meekly): yes :(
by Der Gelb Baron September 27, 2010
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