The act of masturbating while in a car.
Motorbation helps Sandy stay awake when she needs to drive along on long trips.
by Kate Charlton August 07, 2008
the act of vigorously shaking one's head between a pair of large breasts while simultaneously performing sexual acts on one's own genitalia
Motorbation is a large part of foreplay between Steve and his well-endowed wife.
by Paully Dizzle December 13, 2010

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