Pronunciation: (haf'kokt', häf'-), [key]
1. (of a firearm) at the position of half cock.
2. lacking mature consideration or enough preparation; ill-considered or ill-prepared; half-baked.
3. go off half-cocked, to act or happen prematurely: He went off half-cocked and told everyone the news. Also,go off at half cock.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.