Lit Boski 

Lit Boski is another form of "Lit Broski" and Broski is bro, but just spelt differently. Yes, boski does mean some different things, but in this case its just Broski but spelt wrong. When someone says "lit boski" they either just said "lit broski" wrong, or they meant to spell it that way, but if they did it on purpose, it means the same thing as lit broski, but has a bit more of a "powerful" meaning to it in a way.

That's so Lit Boski!
Have you seen his post? It was Lit Boski!

Lit Boski by apandablur July 27, 2019