A flat piece of plastic, wood, or other non-heat conductive material that is placed on one's lap to insulate one's testicles from the heat produced by a laptop, which has been shown to reduce fertility.
A ball-friendly girl that leads to you believe that you will be getting laidbut then doesn't. Also one that brings you close to orgasm but doesn't let you finish.
Sally: "Oh you will get some later... if you are lucky"
You: "oh really now?"
Sally: "No not really."
You: "Testicle Jester!"
Sally: "wtf is that."
You: " It's new and it's you!"