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Applied by a guy when a girl is hot, or to draw attention to the hotness of a girl.
Comes from the chorus of the song 'Get Low' by L'il Jon (3, 6, 9, damn she fine)
Jack: Hey Sam, look at that girl over there.
Sam: Damn!
Jack 3, 6, 9
Sam: Damn she fine!!

Greg: Yo man, she a 3, 6, 9!
by Dickie G March 25, 2005
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