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
by l_n_h March 13, 2017