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The first time you have anal sex in a pool (or underwater). The name comes from the combination of brown dirt and water being mixed together.
Did you hear Jimmy got his mud wings on the weekend?

No way!
Yeah, totally did her in the ass in your pool.
Errrr, yuck.
by FozzWossie October 31, 2011
Mud wings are earnt the first time you have anal sex with a chick.
I just got my mud wings last night when I nailed this hot chick in the ass
by NotMeNotYou May 14, 2010