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A colon fetus (or colon foetus) is a baby born from anal intercourse, that then develops in the colon. This extremely rare occurrence, creates a child that often shows traits of obnoxiousness and anger. The child will in most cases then grow into a fully fledged arsehole.
Bob is such an arsehole!

Yeah, he was definitely a colon fetus!
by TheRosbif January 09, 2018
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