The insertion of ones thumb into the anal cavity in rythem with the pulse of intercourse.
" I was fucking Susan from behind, then I Crank the Tractor, and we were off!"
by crankit May 29, 2008
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When someone or something (vibrator) really turns you on!
When my husband and I have sex he cranks my tractor and gives me multiple orgasms!
by The farmer's wife July 28, 2009
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