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1.
The act of masturbation from a place of great height (buildings, helicopters, radio towers) so as to hit a person or other object with your semen.
I was so bored last night that for a thrill, I went bird dropping.
by Birddropper April 04, 2006
 
2.
The female act of depositing the males semen on to the male, preferably on chest or lower torso, after sexual intercourse.
Cody: Did you hear what Sarah did to Brandon last night?
Keeley: No?!
Cody: She totally gave him bird droppings!
Keeley: Eurgh, that's gross dude!
Cody: Yeah, but sensual...
by Stergus November 17, 2012