Sometimes referred to as "Debby Downer."; Someone who practices hate on someone, or spots out the negatives in something good.
1. Guy 1: Dude I just got Guitar Hero IV!
Guy 2: Same, it sucks. The songs suck shit.
Guy 1: Its not that bad, Debby.
2. Duke is a Debby about the game
3. Man A: I just got you a new Mac computer for your birthday!!
Man B: Throw that shit out Macs suck
Man C: Wow..... Debby