Top Definition
When a man, is making love to woman, in the doggy style position, with his right hand, he acts as if he's gripping the throttle on a motorcycle handlebar. With each rev of the imaginary throttle, his thumb hooks down, and is inserted into the woman's anus.
"I was taxing this slut from behind, and I slipped her the Old Kawasaki."

"You have to be careful with the Old Kawasaki, sometimes you end up with brown thumb."
by Frankie Fish August 08, 2008

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