A No-No refers to a perfect game thrown by a pitcher in baseball. NO hits, NO walks. It is commonly misused to refer to a no hitter in which walks were allowed.
Also known as the "Holy Pocket" by some. Anything you put in it is 100% safe from others. The perfect repellant.
Me: *reaches in middle pocket*
French Girl: "Why are your hands in your no no pocket? Ewwwwwwwwwww. Groooooooossssss!"
Me: "I have two words: Cash. Office." *winks*
French Girl: *visible disgust*