Top definition
When your significant other aims his naked ass at your leg and tries to fart, but accidentally shits instead.
He lifted his leg to fart on her but he shit all over her by accident, and that's how she became a Dirty Meghan.

He thought he had to fart so he lifted his leg and aimed his ass at her leg, but accidentally shit instead causing a very Dirty Meghan.
by Emily, Who Dat, Dickenson September 30, 2010
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