Top Definition
A person of marginal intelligence who enjoys partaking in the exploration of upward concavities. Contrary to popular belief, runt muffins are usually obese, despite their limited diet of female genitalia.
Schmandie is such a runt muffin, did you see the way she looked at the cashier's nether regions?
by ritalinaddict September 23, 2009
5 Words related to Runt Muffin

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