1 definition by Chris Reynolds
Stands for "Pound 'N' Out", the act of shagging a girl and then never speaking to her again, sometimes even denying all knowledge of it even happening. By claiming PNO you can sleep with any ugly girl and not be made fun of by your friends.
Chris: "Rob I can't believe you pounded that ugly girl last night!"
Rob: "It's OK man, it was PNO!"
Paul: "That's OK then kid..."
Rob: "It's OK man, it was PNO!"
Paul: "That's OK then kid..."
by Chris Reynolds August 1, 2006