i Register
In some senses, j-cat is marked as slang, US. Watch for register when choosing this word.
noun
A mentally unstable inmate.
Fuckers never see the light of day. Nevada Fucking Prisneyland, O.G.! Homos, snitches, Chomos, straight-up J-Cats, and children all P.C.'d up together, scandalous shit, dawg!
Some J-CATs didn't even take medication, meaning they white-knuckle this lifestyle, possibly unaware of their deviation from reality and normality.
One who behaves in an erratic or overly excited manner.