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1.
someone who puts people in a sad/bad mood
i dont mean to be a debby downer, but your dog died.
by mufasalalala June 28, 2006
 
2.
n. pronounced: deb-ee douw-ner
1. A outwardly depressed male or female; under any circumstance, this person's main objective is to trash, ruine, spoil, muck-up, jack-up, and in many cases absolutely KILL your joy.

2. A person who has mastered the art of self-pitty; will go to great lengths to get anyone who will listen, to feel as depressed as they feel.
1. Stop sulking. Nobody like a debby downer.

Example:
Sue: Hey its friday, lets do something fun!

Paul: I hate fridays. It only reminds me of the terrible week I just had. (sigh)
by Lyric Sky February 04, 2010