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To masturbate vigourously; to pull ones pudding, bash the bishop, help Kojak put on his polo neck sweater, choke the chicken, load the single barrelled yoghurt launcher, or knock one out!
"That new girl in Accounts gave me one off the top in the back of the cab last night! It was superb!"
by RTR. September 04, 2008

Words related to One off the top

frapp frig masterbate toss wank