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1. knob knocker
used in place of words like gay, stupid, queer, dumb, ect... when describing someone or something.
Wow, your acting like such a knob knocker.

Our mall is so knob knockin'.
2. knob knocker
One who cuts off his own penis and smacks people with it.
Get that thing out of my face and quit being such a knob knocker.
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