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
Get the Downer mug.
Some-one with down syndrome or a stupid person
"That guy is an idiot he gets on like a downer"

Person 1:"Down syndrome people are so cute"

Person 2:Down syndrome people? I just call them downers
by Harry69 February 2, 2011
Get the Downer mug.
Spastic, retard, some one being stupid for no reason and its not funny!
kelly was beeing all stupid and shit, shes such a Downer!!!
by what ever u want it to be September 7, 2005
Get the Downer mug.
1. abbreviated from down-syndrome

2. more commonly used to describe someone who appears and acts like a spastic and is either extremely retarded or un-co
bob is a lazy eyed downer who deserves to be shot
by Hugh_11 September 28, 2005
Get the Downer mug.
1. A person or thing that is innately depressing 2. An animal that falls to the floor and is unable to stand. Downed animals are oftentimes trampled by other animals. It is perfectly legal to allow downers to die from exposure or to throw them live into dumpsters.
The factory worker watched the downer cow slowly die, while eating a hamburger.
by jj975 April 13, 2015
Get the Downer mug.
What extreme System of a Down fans call themselves. Most likely because they are the most kick ass band out there.
Slipknot fans are maggots, System fans are downers.

Tom: Dude I love SOAD.

Jim: You're such a downer.
by beanerwithaweiner June 30, 2006
Get the Downer mug.