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To call someone jacksis means they got totally wrecked, like their life went down the toilet and they ended up in the hospital with a broken leg and a bruised ego.
My cousin got called jacksis after he tried to run away from a bull and got trampled.
My dog got called jacksis after he ate a whole pie and then fell into the pool.
I got called jacksis after I tried to fix my phone and ended up burning my hand.