To make a sequel of something (ex. Games, shows, etc) and somehow fuck the source material up of unfortunately great proportions. The name is derived from the Anime Dragon Ball GT, which was supposed to be (If I recall correctly) a Non-cannon sequel to Dragon Ball Z. But when it released, it gained a heavy negative reception.
Guy 1: "I just watched Season 2 of The Promised Neverland, and it's bad."

Guy 2: "I agree, that Dragon Ball GT Syndrome that invaded the Anime sucks."
by NepgearAfficionado October 2, 2022
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When you can be bothered to explain something to anyone that will take an extraordinary amount of time to explain.
GTS, How do I get a personalized license plate for my car? You need to GTS ! " Google that shit"
by ewanders1 October 10, 2022
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He is the Best gorilla tag player, in fact if you see him you should just give up because he’s to good.
“Look, 15.GT, we should try to run
by brownmonkvr May 1, 2022
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The Worlds best Gorilla Tag player. No matter what happens to the game or him he will still conquer Gorilla Tag
“I heard 15.gt is the best at gorilla tag.” “Yeah” “but I heard he can’t Lucio run” “oh yeah” “what, it’s not like he doesn’t have 2 hands” “oh but it is, 1 hand and still the best, ask him to vert, GAME OVER
by Lousy.gt June 27, 2022
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A supercar made by Nissan since 2008. It's loved by 12 year olds and Ritsuko Akizuki
The NIssan GT-R is one of the 12 year old's favorite cars, along with the Toyota Supra and *insert Ferrari here*
by Sanae Katagiri March 31, 2022
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