1. mod. unprepared. (See also go off half-cocked.)□ So he’s half-cocked. So what?□ You’re half-cocked for everything you do.2. mod. alcohol intoxicated.□ He just sat there, half-cocked and singing.□ Old Jed got himself half-cocked at the reception.
Dictionary of American slang and colloquial expressions. 2015.