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A Slut Muppet is an individual who is easily controlled by/in sexual situations.

One who will do just about anything to get laid and/or can be bribed with very trivial items to gain sex from them.
Guy 1: Dude your sister is SO hot! But I think she's out of my league.

Guy 2: You're right, she's too hot for you, but have no fears, cuz she's a Slut Muppet anyway!
by Etho Aprilis February 23, 2018
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