the act of motor boating but using a woman's ass cheeks in place of a woman's breasts
Bob really is an ass guy, so he decided on motor butting Nancy
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Verb, the act of motor boating a buttocks of your partner by placing one’s face directly between the butt cheeks of his/her partner and blowing air quickly to create a motor boat sound.
Michael placed his mouth on Frances buttocks while paddling out on a surfboard at the regatta and was motor butting her like a pro.
The act of placing your face between one glutes and shaking it violently using both hands
Lindsey's der·ri·ère was so thick that a Chad came out of nowhere and started motor butting her .