The etymology of the word comes from legit. Usually a young kid, aka wannabe, who isn't legitimate yet is called a Jit.
He on the block but he don't know what he doing.
What you spect, He just a Jit mofo
Some one who is younger than u or they can be smaller
This lil jit ruins everything cuh.
a little boy/ girl to describe them in another way
Context: A crazy little boy and someone is reacting to him
Person reacting to him: this jit carzy