off one's chump
off (one's) chump
Crazy or insane. He must be off his chump to pay that much money for that old car. Am I completely off my chump for starting a business in this economy?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
off one’s chump
mod. crazy; nuts. Am I off my chump, or did that car suddenly disappear?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.