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.
by The Muffin Man June 22, 2006