Used as an interjection. Tells the subject he/she a)Is moving too quickly, b)Has gone too far in speech or action and needs to "back up" or c)Has breached the TMI rule and divulged something inappropriately personal.
Larry: Beth is the best thing that ever happened to me. I think I'm going to ask her to marry me. Will you help me look for a ring?
Danny: Fire The Retros! You met this girl like six weeks ago. Slow down you moron.