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Entering a situation without being fully prepared.
Origin: Muskets and revolvers have a lowered, half-cocked, and full-cock position for the hammer. During loading, the weapon is brought to a half-cock. The weapon must then be brought to a full-cock to be used. Forgetting to cock the weapon leads to it being unprepared for combat.
The boxer did'nt do any research on his opponent, and went off half-cocked to fight somebody twice his size.
by moniker19 October 09, 2008
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Literally everyone, ever. Including the writer of this definition.
by masokitsune January 17, 2019
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2
Acting on assumptions or partial information.

Based on old firearms, that if not fully cocked (thus half cocked), would not fire.
You've only heard his side of the story! You can't go running around half cocked spreading rumors about her!
by RobbyPants June 05, 2007
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3
Ajective decsribing behavior. Usually implies that the behavior was impulsive, done without considering the consequences.
After Sarah insulted Jimmy he went off half-cocked about her haircut.
by muttleydeed April 22, 2006
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4
being about half drunk
after those shots that we had i'm about half cocked
by justin August 04, 2004
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6
"I thought it would be a good idea to show off my package... too bad I pulled out a flacid-boner"
by T.A.D. April 06, 2005
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