J-CAT is an word now used in street slang that originated in the U.S. Federal and State prison systems as an acrynym with stood for J-Category inmates or J-CAT which is s housing unit for sex offender [..]

someone who be flakin on the plans, without telling you a word

A psychotic breakdown.

Sketchy Jay iso sketchy and a total JCat. He has a haircut like a Mormon and wears earmuffs to sleep

a person who doesn't know how to act in jail (when in jail)

Someone who is constantly lying about certain situations to make another look like they are looped and to make themselves look like they aren't doing that.