fluff muffin

A big puffy Vagina with fluff covering it. Not too sexy.

sophie pulled down her pants to reaveal a smelly fluff muffin which paul was glad to chomp on and find the cherry in the middle.

yeasty fluff muffin

A stank pussy, in specific one with a yeast infection

Man, I woulda smashed that but I could smell she had yeasty fluff muffins.

Fluff a muffin

When told to "fluff a muffin" it means to back the fuck down.

Boy: I just want to look at ur phone.
Girl: Give it back!
boy: NO
Girl, *smacks boy* and takes. GO FLUFF A MUFFIN.
Boy: fuck off.