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The act of a female taking her breasts and erotically rubbing them around a man's shoulder, somewhat in the manner you would if he was tit fucking her, but with his shoulder.
Guy1: Dude, last night my gf totally shoulderboated me! it was aweosme!
Guy2: wtf is Shoulderboating?
Guy1: oh it's when she rubs her tits on my shoulder
by scarysnowman14 April 29, 2011