I doubt you will get an OG trickshotting GT but you could fiddle around with it.

Try looking up weird words then go on a gamertag check to see if it's take or not.

Zexmazy's taken..? bahaha. Yeah man, trickshotting and call of duty online is so old. Almost every gamertag in the book thats decent's been taken. Not sure if you'll find what youre looking for. I'v been having the same problem.

Think of something short and original or find a random noun picker website like most trickshotters do Think of a name thats not associated with anyone or anything youve heard of like Gwidt. Nobody else was called that and people were still using x's and z's which look rreeaallyyyyyy nooby. 5 Letter gamertags look the best in my opinion. Keep it professional aswell nobody wants someone on their f/l or channel called Pxezz or Ch33se XD

Goto urban dictionary and click random until you find something you like haha worked for me I got a couple GT's I like that way it might take a while sometimes though