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6.
a person who doesn't know how to act in jail (when in jail)
These new bitches in are tank are straight j-cats.
That fool keeps cattin off.
by Maguire Corrections October 11, 2010
 
1.
(Prison/Jail Term) Any person who is mentally unstable or requires psyche drugs to maintain.
That fool over there talking to himself, walking like a chicken is a J Cat.
by Wood Dawger October 02, 2005
 
2.
Otherwise known as "Category J" in the California Penal Code, it refers to an inmate deemed too mentally unstable to remain in General Population.
"Motherfucker went J Cat on someone in the yard; now he's in ADSEG."
by J. Knox April 22, 2008
 
3.
California Prison slang for a mentally Ill person. Shortened from Catagory "J" (Meaning Mental Patient/Inmate) to Jcat.
That guy down the tier talking to himself is a jcat!
by CJ Smith May 16, 2006
 
4.
An individual who is looped up on psychiatric medications.
That girl's a j cat.
by Doug March 28, 2005
 
5.
A psychotic breakdown.
anymore of this and im going to go j-cat.
by homerower April 13, 2006
 
7.
An fan of the amazing and talented, new boyband Union J. Jcats are loved by the boys from Union J. JCats will understand all the inside jokes including "believe the hype" and "you sound like a fifty year old man from Birmingham". Jcats are part of an amazing fandom and will support the boys forever!
" why is that girl running round shouting ' I'm a spatula because I'm so flipping crazy!'?"

" oh she must be a JCat!"
by Jcat<3 March 09, 2013