from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Informal Inadequately or poorly prepared: a halfcocked plan to buy out the company.
- adj. Being at the position of half cock. Used of a firearm.
- adv. Informal In an inadequate or poorly prepared manner: went off halfcocked and bought all the wrong items.
Sorry, no etymologies found.
Individuals who may be susceptible to motivational ideas and theater, can go away "halfcocked" ... the a little knowledge is a dangerous thing syndrome.
So it really does have consequences when Congress goes off halfcocked and does these things.
He isn't some comedian or halfcocked clown who has the luxury of alienating a sizeable portion of the US.