Something so cool, breh, you don't even know, fam. Generally used with a form of the word bro imediatley following. e.g. broseph stalin, brologna sandwich, etc.
Gym Brodude 1: "Suh dude, I just lifted like 400 pounds, it was lit, fam."
Gym Brodude 2: "yo fam, what is this 2016??? we don't use lit bruh, we use Meatly, bropleb!"
Gym Brodude 1: "but 2016 was meatly, Brotein Shake."
Gym Brodude 2: "Shut up fam, don't act like you're cool enough to know what meatly means."