its a california slang term which defines a type of weed that is so shitty it causes "stress". the slang originated from the outskirts of southern californian beaches which was passed along until it reached the main cities. many tourists come to CA looking for bomb ass chronic, or chron, but end up with stress because they don't understand CA slang.
Person A: Dude i bought this bomb ass chronic for a tight ass price from a dude that's in my Bio class dude...
Person B: What the fuck are u talkin' about dude... that shit's haggard as fuck... look at it!
Person A: ur right dude it looks shitty... it's not even furry and fluffy dude.. what should i do dude
Person B: it's ur fault.. dude.. u bought stress u fucking idiot
Tourist: hi im from Canada!
Cali pothead dude: that's chill...
Tourist: u got weed, eh?
Cali pothead dude: maybe..... what u lookin for dude.. i mite got what u need
Tourist: im looking for something that might help my "stress"
Cali pothead dude: so ur looking for stress?
Tourist: ??? yeah yeah wutever dude yeah ???
Cali pothead dude: haha 25 bucks a gram dude
Tourist: wut the fuck this is shitty!!!!!
Cali pothead dude: ur face is haggard