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1.
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!!!!
by zumzy January 20, 2003
 
2.
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.
by RatchetBoo April 30, 2003