Very intoxicated by drugs, especially marijuana. The actor admitted to being stoned silly for most of his time on set. There's no way I'm letting you drive—you're stoned silly!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. alcohol or drug intoxicated. I hate to get stoned silly in public. At home—ah, that’s a different matter. He got stoned silly at the rally, and for all I know he is still there on the floor in the corner.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.