YouTard 

Someone who posts a meaningless video on YouTube.

I'm sending you a link to a 28 second clip I found on YouTube, posted by a YouTard, which has no apparent purpose other than to take up space.

YouTard by circushead December 31, 2006

Youtard 

Name given to all the idiotic people who post comments on Youtube.

"Vile rage? Rampant racism? Huge neckbeard? Yep, we've got a Youtard on our hands. I wonder what the thinks about the Moon Landing..."

Youtard by DiseasedTempest December 27, 2007

youtard 

The large number of people that comment on youtube videos who do at least one of the following: troll, lack proper grammar/spelling skills, post ridiculously stupid comments that prove they have a low iq, or ask people to give them a thumbs up...

Bill: That video was hilarious man. Did you read some of those comments also? Those were pretty good too....

Jim: No, I usually don't bother reading them because it is just a bunch of youtard nonsense.

youtard by the dark seahorse May 10, 2011

Youtarded 

Someone who, when on YouTube, keeps watching "Related Videos" until he/she can't remember what it's supposed to be related to or where they started.

Adam: Man, last night I watched this sweet video on YouTube about __________ and an hour had passed before I realized how Youtarded I was.

Matthew: Dude you're a total Youtard.

Olivia: Yeah get a job you Youtard.

Youtarded by Your Zaluu March 4, 2010

You-tard 

In the farewell stage of an exchange of greetings and/or pleasantries, a 'you-tard' occurs when one party replies "you too!" when it does not apply.

Waiter says "Enjoy your meal" , you reply " you, too! A you-tard has occurred.

You-tard by MHB May 14, 2015

Yortard - noun

An individual afflicted with a particular, highly specialized learning disability which prevents them from acquiring a working knowledge of certain American English grammar* rules pertaining to the proper use of the words 'your' and 'you're' in the context of written communications.

Conjugation
1. possesive: Yourtard
2. plural: Urtards
3. adjective: You're-tarded

Etymology

1. You're yoor; unstressed yer contraction** of you are: "You're certain that's right?" > Can be confused: yore, your, you're.

2. Retard: ree-tahrd a person who is stupid, obtuse, or ineffective in some way: a hopeless social retard.*

Notes
Contraction - A shortened form of a word or group of words, with the omitted letters often replaced in written English by an apostrophe, as e'er for ever, isn't for is not, dep't for department.
>> Usage: Contractions such as you're, isn't, couldn't, can't, weren't, he'll and they're are symptomatic of informal speech and writing. They are common in personal letters, business letters, journalism, and fiction; they are rare in scientific and scholarly writing. Contractions occur in formal writing mainly as representations of speech.

** specifically the rules surrounding morphological differentiations between homophonic contractions vs. possessive phonemes

See - Mac Lethal's epic Yortard dis-rap: y outube dot com / watch?v=32p8d6OudgU

Yortard - noun

A typical Yortard might write, "YOUR A DEAD MAN!"

Then, if you were to ask why, they might reply,

"Cuz my dad found YOU'RE autographed first edition

of the MLA Rubric under my mom's pillow AGAIN!

Your gonna get you're ass beat if you come to...

You'reba Linda!"

Yortard - noun by N8, Ideal, Duke Hollister June 15, 2013