(noun) a pessimist, one who looks on the downside of things, has zeroconfidence in themselves, criticizes themselves, sees the glass as half empty, you get the picture.
kind of like Grace Dimond
Grace Dimond: Ugh, my art project stinks. I'm going to fail. I suck at art. I will never get into college. I am so bad at school. I fail at life.
Julia: Grace Dimond, you are such a Debbie Downer.
A Facebooker who uses Facebook as a media to convey sad, woeful, and depressing stausi for no reason, bringing the morale of all that see plummeting to the ground.
The person who, in which a state of high, decides to down on a chill-group discussion.
-Dood, this is so relaxing.
-Ya, this is mad chill.
-We need to do this more often.
-I can't believe my girlfriend banged another guy.
-YO! Why you such a Debbie Downer
-_-