When a woman or man with extremely large breasts, nuzzles their face in between their breasts and shakes vigorously while making motorboat noises.
My boy Jerry has some big as titties.
I think he stays home and motorbates all night.
by brasco July 16, 2008
To simultaneously masturbate and motorboat
I motorbated with Sydney last night!
by GassySellsDankWeed March 31, 2015

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