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A knob knuckle is the term used for accidentally grabbing a testicle during the act of male masturbation, then yanking it swiftly up into the centre of an erect penis, giving a knee cap, or knuckle type appearance in the centre of the shaft. - To knob knuckle someone is to cause them pain through some form of passive aggressive behaviour, often resulting in some subtle yet severe psychological trauma. - To be a knob knuckle is to perform activities in a careless fashion, not paying full attention to the task in hand.
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