in the gun

in the gun

slang Drunk. Do you remember last night at the bar at all? You were really in the gun.
See also: gun
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

in the gun

mod. alcohol intoxicated. (see also shot.) When Fred is in the gun, he’s mean.
See also: gun
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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References in classic literature ?
In any case, it was decided in the Gun Club that Blomsberry brothers, Bilsby, and Major Elphinstone should go straight to San Francisco, and consult as to the means of raising the projectile from the depths of the ocean.
Weapons produced in the Gun Quarter could be found on the battlefields, not just of the two World Wars, but also the Napoleonic Wars and even the American Civil War.