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1.
A state in which one is under a strong influence of marijuana, greatly inhibiting their ability to think clearly and control their behavior, making one seem almost mentally handicapped.
This weed's got me so hightarded, I can't even tie my shoes.
by BennyandJoon October 18, 2008
 
2.
When you've gone and smoked yourself retarded, or you are retarded and stoned. Either way, you are high-tarded.
At the grocery store...

Laura: I think our sacker was high!

JP: Uh, no, I think he was just "slow"

Laura: Dude, I guess that makes him high-tarded.
by Laura S May 17, 2007