itchy trigger finger
Definition from Wiktionary, the free dictionary
- (idiomatic) a tendency to act in haste or without consideration
- Given any remote chance to gun down an effective spokesman for conservative economics as a secret fascist and torturer, even Nobel laureates can, we see, succumb to an itchy trigger finger.
- (incited by anger): quick-tempered
- "Nobels and Smears", Wall Street Journal, 1976-12-10.