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1.
1) A winter game in which one person wearing a puffy coat forcibly bumps into another person wearing a puffy coat, triumphantly declaring, "Bumpercoat!" It is similar to bumper cars, but with humans and puffy coats.

2) When you're fucking a girl doggy-style, you pull out and skeet all over her ass, coating it with jizz.
I totally bumpercoated Eliot last night!
by Jibily December 06, 2007