Definition of "knee-trembler" []

• A casual outdoor sexual encounter (commonly with a prostitute), usually in an alleyway or against a wall, with the man standing and the woman's knees raised (noun)

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• "Little knee-trembler yesterday let's see if anyone catches THAT reference!"
• "It started off as the prototypical knee-trembler against one of the massive archives."
• "And if I hadn't any money, I'd just have to give him a four-penny knee-trembler, for free."