v.) to take back you poop; (n.) the process of sucking your poop back into your ass.
My stomach was empty so I had to unpoo.
by John Williamson March 27, 2007
The act of returning fecal matter to the orifice from which it came.
I asked this street wino why he was shoving turds up his asshole, and he told me, "I'm unpooing."
by Stan B. January 30, 2003