look up any word, like jamflex:
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 28, 2010