A dumbass who gives thumbs down on a perfectly good Urban Dictionary definition. Most downers can be found on the main page where the word of the day is located. And there are quite a few of them.
What the hell?! I got 500 thumbs up and 2000 thumbs down! Buncha fuckin' downers!
by TheSaltyWhore February 19, 2011
An idiotic person that won't stop their annoying ways in public, and just does stupid things (trying to be funny, and trying to fit in, but really.....there's no hope for them).
"Seriously, would you stop being such a downer, and get you head back in the window."
by Whitney J May 23, 2005