A tweaker who has done to much meth and is mentally "out-there".
"Man what a shard tard. He thinks there's really people in the walls."
"You're acting like a real shard tard."
by krazzekiki June 26, 2006
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When you first get out of jail and you attempt to get high on dope. The smallest amount turns you into a shard tard.
Hey I'm out who wants to make me Shard tard?
by ivana flailsomemore November 27, 2016
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