A person who is dirty and horny and overall sexy. The word comes from the last name of Green Days bassist Mike Dirnt.
That boy looks so dirnty in those black skinny jeans.
by Maria Taco™ April 6, 2007
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A sex position.
where you do what Mike Dirnt does in the video of King for a day/Shout/Stand by me by Green Day at the Trabendo club in Paris, France

except your having sex...not playing bass.
Random Guy: "Dude last night i totally did the Dirnty to Brittney!"
Random Guy's Friend: "Nice man!"
by Armstrong Annonymous March 29, 2010
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