The act of repeatedly slapping one's member against the face of one's partner during foreplay.
I was Bobby Knocking my girlfriend last night, which turned her on immensely
by Barry_2007 August 25, 2007
I game or a prank younger people play which involves knocking on someones door and leaving before they answer
you wanna go bobby knocking later?
by Ian Handley September 14, 2006