Top Definition
What happens when a fat person if wearing a shirt that is to small for them.

Like how muffins overflow their case and flop over the side, the person's fat flops over the top of their trousers to create a muffin-like appearance.
Person 1: She bent over and the fat was drooping like a muffin!

Person 2: Eww! Muffin Waist!
by Kellan Fisher September 30, 2009
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