Characters
They were both high. They'd been smokin' everything but their shoes.
— Clairee Belcher ‧ Steel Magnolias
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker reports that two people were thoroughly intoxicated, then caps it with an exaggeration: they had consumed everything by smoke except their footwear. The comic overstatement stretches getting high into absurd, all-inclusive excess, delivered with dry, gossipy relish.
Context reviewed