Jit is a slang for a friend, bro, homie. Whatever the fuck you wanna call it. Its popular in between 2021-2022.
Ex. 1:
Friend: bro i accidentally made my sisterpregnant and my girlfriend found out!
Me: Nigga what? Nahh jit u fucked up.
.
Ex. 2:
Me: ay whats up jit?
Tyrone: nothing much dawg