off your 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?
See also: chump, off
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

off your chump

crazy. British informal
The literal sense of chump meaning ‘a broad, thick block of wood’ led in the mid 19th century to its humorous use to mean ‘head’, with the implication of ‘blockhead’.
See also: chump, off
Farlex Partner Idioms Dictionary © Farlex 2017
See also: