Kid isn't just a word for someone of youth. The slang kid is what you call someone. It's used as if you were saying dude or bro. Example:
Kid stop kicking things at me
Yeah, you're dumb kid
Kid what are you doing
lmao
Kid is used for insults as well. Like:
Yeah youre just some kid get outta here
You're dumb kid
Kid is used along side of the slang tip and jip and
stick and ran.
Kid is also used for other
people like
Some random kid showed up
And kid could be used for any aged person. They
don't have to be an actual kid