Phrase made popular by musical artist Rob Roy in the song "Fur In My Cap" meaning that there is a girl of attraction or possibly a stripper seated on your lap.
"So, what are your plans for tonight?"
"I plan on hitting the strip club to get some pussy in my lap"
"Pussy in my lap, bird in the sack, fur in my cap" - Rob Roy
A phrase that a guy will say to his girl in order to try and keep her from cheatingon him
Ted: "Now have fun with your friends at the lake and keep my name in your pussy!"
Lana: "Whatever, Ted. Just cause Renny is there don't mean I'll stray."