Definitions by JoD CoD

U.P.I  

Unidentifiable Party Injury

Upon waking from a night of partying, you find one perhaps two bumbs, bruises, scratches, or bites and are not completely certain of there origin

Partygoer#1: Wow!! What the hell happened last? I am riddled with U.P.I

U.P.I by JoD CoD February 18, 2009