eat one's gun
eat (one's) gun
To commit suicide by shooting oneself in the head through the roof of one's mouth. I didn't expect anyone in the movie to die, so I was shocked when the main character ate his gun.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
eat one’s gun
tv. to commit suicide by firing one’s gun into one’s mouth. The cop was very depressed and ended up eating his gun.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.