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When someone uses there hand to knock a standing man's flacid penis from side to side. The equivalent of motorboating.

Can also do 'tennis ruddering' when you use both hands and bounce the penis between them.

Also possible to do it up and down or with your foot.

Surprisingly satisfying for both particiants
Guy "can I motor boat you?'
Girl "only if I can do some ruddering of you after"
Guy " oh yes please"
by flemmimaid October 22, 2012
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2
When you stick your face in someones ass and proceed to 'motorboat' them
Man this chick has this huge ass I could spend all night ruddering her!
by Demi-God.J January 09, 2011
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