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1 definition by Morningrelease

Verb: During the course of pooping your poop stops to urinate and then continue your bowel movement. The intermission of pissing during a shit session.
While pooping your anus tightens for release of urine. Once completion your anus relaxes and your poop continues.

I had shit so bad but I drank so much I had an Interpissen.
by Morningrelease February 22, 2012