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.
You are such a cloaca! Let go of my gun, you addled egg!