Top definition
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
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2
cloacawork
You are such a cloaca! Let go of my gun, you addled egg!
by Ollie the Dog December 28, 2003
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