I was freaking frustratinged today by a dog water at work shift. I was freaking frustrated today by a dog water at work shift.

I'm not sure what you mean by a dog water. If you'd like to say that someone was dog water in English slang it's used as an adjective. ex: "They were dog water."

I was freaking frustratinged today by a dog water at cowork shifter during my shift at work. I was freaking frustrated today by a dog water coworker during my shift at work.

I thought I might going to kill him. I thought I might kill him.

I thought I might going to kill him. I thought I might kill him.

I'm cappexaggerating. I'm exaggerating.

You can use the slang term "capping" but I personally never use it. You can also say "I'm lying."

I just felt like that, noI don't really want to do that. I just felt like that, I don't really want to do that.

I just felt like that, noI don't really want tona do that. I just felt like that, I don't really wanna do that.

Instead of "want to" you can say "wanna" to combine them - it's super casual talk so use it only with friends.