It's when you have a little but of poop sticking out of your anus and you can't quite get the whole turd out so you have to pinch it off and then it looks like a ball type thing or a puff pastry, or rather a muffin.
I tried to take a shit yesterday and I couldn't get the turd out, there was a little inside of my anus for like five min; man that buttmuffin was a tough one!
by ButtMuffin July 5, 2006
Get the buttmuffin mug.Butthumper, someone who is a homosexual faggot, and likes to take it in the end. Also someone who walks with their butt sticking in the air!
by Maria Peters October 2, 2007
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by Eagle Boy January 7, 2003
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