Top Definition
Slapping or smacking a girl's crotch with your boner and then proceeding to not sleep with her.
"That slutty girl thought she was going to get it good, but he ended up giving her the Gentleman's Knock."

or

"He was too much of a gentleman to get in there, so he just knocked."
#boner #vagina #sex move #slapping #gentleman #knocking
by Amynonomous March 31, 2014
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