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When a male motorcyclist hits the brakes harder or more frequently than he should in order to have his female passenger thrust her womanhood into his back. Otherwise known as a cheap thrill.
The perv motorcycle rider frequently braked harder than normal in order to have get a Boob Jam from his big breasted passenger.
by Jamin-mon July 14, 2008
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The build up of dust and dirt between the boobs.
"Wow man she stinks of boob jam"
by l_n_h July 17, 2017
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