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1.
A person who can't resist making asinine comments.
"fair enough my dougie. I'm just livin' my life"
Troy Jones

"Dude, you are a Ttard. Can't you think of anything meaninful to say? What a Ttard!!!"
by HWC anonymous September 10, 2010
 
2.
Anyone who is very bad at texting. Thought to originate from 'T9-tard' - people who fail to fix their T9ed texts.

e.g.
dont fuck with me - correct T9
foot dual with of. - usual T9 typo.
Nick is such a t-tard that I'm thinking of buying him a blackberry.
by Envious 314 March 16, 2009