Expression used by males mostly in their conversations about girls. Fluffin the muffin or to fluff the muff is normally used when a guy talks about having sex with a female. It is a more polite way of saying that you are going to fuck her brains out.
Hey Marc, we are gonna fluff some muff tonight at the party!!!!
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When you walk by somebody with a big juicy butt and squeeze their butt cheeks together.
Susie Q likes to fluff Charles's muffin when she walks by him.
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A term used by Killysunt on YouTube; basically means "just fucking with you."
Me: Your cat's dead. Just fluffin' your muffin