A Chocolate Muffin is derived from the frosted muffin. It is a type of a rim job. It is when a man ejaculates into either a woman's and/or another man's anus and then proceeds to lick and/or suck his own semen out of the anal cavity.
Carissa's favorite type of rim job was the chocolate muffin next to the rusty trumpet of course.
The most delicious muffin!
I need a chocolate muffin for my banana nuttin
c'mon girl, just gimme that stuff/you'll be huffin 'n puffin' when I'm stuffin that muffin/.....gimme that chocolate muffin/hot out the oven/your chocolate muffin