a theory that a woman, no matter how ugly she may seem at first, will eventually look beautiful to you if you see her every day all day.
Based off the theory that sailors used to spend months at sea and started to slowly see manatees turn into mermaids.
Joe: Dude Kelly is so hot!
Tim: Are you nuts?! It's probably just the Mermaid Theory. you have her in every class.
© 1999-2015 Urban Dictionary ®
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