Something that is ok or fine, It isn't good or bad its just alright, it can be used to insult something but it can be sometimes misinterpreted in a different way.
This burger is pretty mid
Or of they are using it in a bad way:
This burger is just so mid!
something is that is medium to average in the category that it is used in
Sandra bullock is a Mid actor - Sandra is an average actor
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.
“Yo bro that’s some mids you got there”
Slang for "I want to be penetrated really hard homosexually" which I show by wearing a slutty outfit, make-up like lipstick et cetera
Person 1: "This dude is mid".
Person 2: "Oh him? Yeah, I fucked him in his bleached asshole too".