The act of a female "going commando." It can get pretty messy down there, so it is up to the labium majora and labium minora to flap around freely and fight off any kind of dirt or grime.
Jon: "Hey Sally, wanna do the dirty?"
Sally: (removes pants) "What kind of dirty?"
Jon: "Eww God. It looks like you rubbed oatmeal all over your vagina!"
Sally: "I wouldn't doubt it... I have been mudflappin' all week"
Jon: "Now I see why they call it the dirty, baby."
© 1999-2015 Urban Dictionary ®
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