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Being a JCat means you are dedicated and obsessed with the British band Union J. If you are a JCat you'll know that George is the cute one, JJ is the dumb one, Josh is the weird one and Jaymi is the sassy one.
JCats can be cute, but if you insult one of their boys they will kill you. They are especially protective of George as he's like a baby and he is just fucking adorable, although we would actually love to have sex with him and all of them.

Yes, JCat is a cheesy name but we don't care because we're cute and better than you.
Also to be in the fandom you'd have to accept that yes, Jaymi is gay, the boys have a random liking to the hobby of twerking, mostly George, Josh has better eyebrows than you, George looks like Miranda Crosgrove, they are absolute freaks of nature and Josh has a twitter for his cat Oreo and pretends it's the cat that actually types the stuff.

Other than that, the boys adore their JCats and are always thanking them and telling them how much they love them, so come join the fandom!
"We love our JCats, they mean so much to us. We love you!"

"Does Taylor Swift have a beard?"

"A cabbage."

"Probably the sugar babes."

"Guys, let's twerk!"

"Oops! Monkeys don't swear!"

"Union J, the J stands for jackets..."

"Winner winner, chicken dinner!"

"I'm JJ and I like to ride ponys."

"And everyone was going, where's Josh, where's Josh? Where was he? Sitting on the toilet playing Pokemon."

"The wheels on the bus go round and round."

"Your our Union Jamily."
JCat by UnionJamily March 19, 2013
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The fans of union j (a british boygroup) are called jcats. People who say ''You're fan and I'm a jcat'' are actually wrong because a fan and jcat are the same,but jcat sounds just really cringey and cheesy. You're are not better than other people when you call yourself a jcat. So for the cheesy carrots out there who are thirsty for retweets A FAN AND A JCAT ARE THE SAME but the fandom is really lovely not that big so many people know eachother there is ofcourse sometimes stupid drama but we get through it everytime TOGETHER WE'RE ALL IN THIS TOGETHER BLABLA we're bad bitches yo yo yo choo choo luff u all we got that british swag.
Girl : DID YOU HEAR ABOUT THAT BOYGROUP
Girl : YES THEY'RE SEXGODS !!!!!!

Girl : Rt if you're a jcat and not a fan
Girl : do you need some water?
jcat by imanotafanimajcatyolo December 15, 2012
Related Words
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!"
JCat by Jcat<3 March 9, 2013
noun-
Literally meaning *'J'-Category*
—>California prison slang<—

A commonly used phrase in California prisons indicating a mentally unstable person, or someone whom is intentionally or unintentionally acting mentally unstable. Most commonly refers to a person who has been involuntarily admitted to mental health services, but also may be used as a derogatory adjective.

Derived from inmate mental health codes found in Article 9 and inmate classification administrative determinants found in Article 10 of the California Department of Corrections and Rehabilitation's Title 15, Rules and Regulations:
->"Article 9, section 3364.2 (j) The judicial hearing for an order authorizing the involuntary administration of psychiatric medication to an inmate shall be conducted by an ALJ"

Note: the 2020 Title 15, Article 10, section 3375.2 (17) has been revised to remove the 'J' designation and replaced with a 'PSY' three-letter code.

Alternate spellings:

Jay-Cat

jaycat
"Hey man, you see that guy over there? Yeah just don't interact with him, he's a j-cat for sure."
"Oh yeah, that guy Ronny just came back from Classification Committee and he's now a confirmed j-cat."
"I was grocery shopping yesterday and some j-cat came up to me and just started incoherently blabbering."
"Yo, Billy just acts like a j-cat so he can get free psych meds."
J-Cat by Pankakke.exe November 6, 2021
(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.
J Cat by Wood Dawger October 2, 2005
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."
J Cat by J. Knox April 23, 2008
An individual who is looped up on psychiatric medications.
That girl's a j cat.
j cat by Doug March 28, 2005