when referring to weed, the word is self-explanatory; not good, not bad, just middle tier. the definition tends to get twisted as some people use it to refer to dirt-ditch weed.
a group of kids who are weak and compared to schwag weed, hence mids. Generally are posers of smokers or just annoying people who need a term to describe them.
"I can't wait to graduate from this school, its full of midskids."
A saying used when talking about mids (low grade marijuana) to explain that due to financial reasons one decided to buy a large amount of mids instead of small amount of heads (high grade marijuana).
Matt: Why are you smoking mids? That stuff is shit
Joey: Dude, mids feed the wolf.