When two or more (typically) females either purposely/accidentally/playfully perform one of the following
- “bash boobs”
- “collide breasts”
- “Bop Boobs”
- “Meet at the years”
- “Mushing of the mammories”
- “Jug jousting”
-“Meeting of the melons”

Any type of tit-to-tit combat is typically nuanced within the realm of bumper boobs.
Oh, bumper boobs! It’s an amazing sport where women bop boobs!

“Did you see Mandy and Bernice?! They dumped ‘em out and played bumper boobs!”

“Larry, I don’t know...
by Dickered Ray January 25, 2020
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A novelty item that is attached to a vehicle's trailer hitch.
Cindy: "I just got some Bumper Boobs, and I'm gonna put 'em on my truck hitch."
Darryl: "They're just like my Truck Nuts."
by Bonch Nifkin January 22, 2013
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