It's a verb, noun, adjective, adverb, conjunction, and
Where, when, how, & why was this word created?
Nobody knows, but it's all good.
Alright so you can use the word Shil however you want to but it's sometimes used as a substitute for other words or phrases wussup shil.
It's surprising how fun it is to use.. it's hard to explain but it can be catchy if you just say it a few times.
If you want to know more, find somebody who knows the word well and ask them.