Adj: Shortened version of American girl's name, "Stephanie". A Stephi is extremely smart, very outgoing, and has a TON of friends. A Stephi often growls at these numerous friends, is a total cheesehead, and is most often the cutest kid ever. Not to mention her extraordinary talents in all aspects of the musical world. A Stephi is also usually a goddess of sex and everyone wants her smokin' bod.