Muff (M.U.F.F.) - Mandatory Ugly Fat Friend. Something that follows every hot girl in order to make it difficult for you to enjoy your time with your hot friend. They are never enjoyable to be around; a muff's only purpose is to make it difficult to game on the hot girl you like.
You: Man, I'm definitely hanging out with Marissa tonight!
Friend: Too bad her muff will be with her!
You: Are you serious?!?!? I hate Brenna! She's definitely going to Cock Block
Friend: No one likes a muff...
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