A state of being in which a person does what they want, doesn't give a fuck about any other shit going on, and knows that they are being booth.
The process of acting this way is known as "boothing".
"Did you see that guy walking down the sidewalk? He just punched a guy in the jaw for walking into him!! He's being so booth."
"Yeah, I saw that. He's boothing like a motherfucker."