- brain fart: It means you just forgot something. Whats two plus two? Ummmmmm (Brain fart) 5? It's just a slang expression meaning a temporary memory lapse, like you suddenly can't remember someone's name, or you forget the answer to a math problem. It happens to everyone at one time or another
jul 15 2010 ∞
nov 8 2010 +
nov 8 2010 +