The name you give to creepy losers who hit on you when you're out on the town with your friends and you don't want to give out your real name.
It's best to choose something common that sounds believable & easiest to use the same name every time. This way, your friends are less likely to accidentally blow your cover by screaming, "HEY, MARIE...MARIE!!" at you when you're mooching free drinks from a guy who thinks your name is "Amy".
Random Douche Bag: "Heyyyy, whazz up, baby?! Yer lookin' fiiiiiner than a new set of snow tires. My name's 'Chance'. Do I have one? Har-Har-Har!!! Seriously, baby...what do they call an angel like you?"
Erica: "Marie, why does this Douche Bag keep calling you 'Amy'?"
Marie: "You didn't think I'd give him my real name, did you? I gave him my Club Name, fool."