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1.
A troll who down votes comments/submissions for the sole purpose of angering and confusing people.
I log on UD today and I see lots of words of the day's down voted. Looks like the work of a down voter troll.
by A2P July 11, 2009
 
2.
Someone who goes on Urban Dictionary and down votes EVERY definition just because that's what they do. It does not matter if it is the correct definition they will still down vote it.
Guy 1: Hahaha look at that definition it's so funny!
Guy 2: I'm down voting it.
Guy 1: Not cool, why would you do that?
Guy 2: Because i am a down voter
by ihatedownvoters February 22, 2010
 
3.
A user on a website that only gives negative ratings.
A downvoter here on UD would do nothing but thumbs down definitions.

On YTMND, they always give sites a rating of 1 star, regardless of whether it sucks or not.

On Threadless, they just sit there, continuosly clicking the "OMG STUPID" button. And they're everywhere.
by spell it rite October 16, 2006