1 definition by MyTwinBrotherIs....

When you go to kiss someone and accidentally headbutt them with your nose
Guy 1 : "Dude, I was totally getting on with this girl and then...."
Guy 2 : "Then what?"
Guy 1 : "I nosedived"
Guy 2 : "Oh"
by MyTwinBrotherIs.... October 5, 2008
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