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1.
Someone who, in jail, is put in a special area and wears a special uniform due to their unequaled crazy and insane behavior.
Sam is a Jkat.
by LouLou j. Kat January 24, 2011
 
2.
a jagger, beaner, or mexican
look at dem j-kats playin soccer
by oscar da sav November 03, 2007