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1.
The act of placing bumper stickers on people's cars that do not want them there. Often done with very innapropriate or embarassing bumper stickers to prank friends.
John is gonna be so pissed when he finally sees that he's been driving around with that gay rights rainbow bumper sticker we put on his truck after a successful night of bumper sticking the whole parking lot.
by tmoney234 March 09, 2011
 
2.
The act sending a "friend" on the social networking site Facebook a Bumber Sticker.
I was bumpersticking a lot of pictures to friends, such as a picture of McLovin from Superbad.
by dumbblondemrf March 26, 2008