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 August 05, 2008
Get the BOOB JAMmug. by l_n_h July 17, 2017
Get the boob jammug.