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Like motorboating, except instead of tits, it's with your boner.
This girl motorbonered me last night. Shit was so cash.
by kholms89 December 04, 2010
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Boner, while riding on a motorcycle, caused by seeing a hot chick riding a motorcycle.
That fox on her crotch rocket gave me such a huge motorboner, that it took me half an hour extra to get my motor pants off.
by MotorJ May 12, 2016
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