The combined intestinal, urinary, and reproductive organ of birds, amphibians, reptiles, marsupials, and monotremes. In other words, it's an anus, genitalia, and urethra all in one.

Just consider that for a moment. "Combined intestinal, urinary, and reproductive organ"...let that sink in...........Ewwwwwww.....
I was horrified to discover the lurid details of avian reproduction--which involves a disgusting organ called the cloaca.
by mazurkamatt November 21, 2006
An asshole
You are such a cloaca! Let go of my gun, you addled egg!
by Ollie the Dog December 28, 2003

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