Where one uses the mail slot on a door as a makeshift glory hole to receive fellatio.
Man, I got the best door Knobber last night.
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A man or a women puts a door knob in their butt then someone is on the other side twisting the door knob.
Ryan: โdidnt Rebecca come over last night?โ
James: โyeah I gave her a door knobber.โ
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