trigger-happy

1. Having a tendency or desire to shoot a firearm before adequately identifying the target.
2. Inclined to react violently at the slightest provocation.

Inclined to act violently at the slightest provocation, as in They feared that the President was trigger happy and would send in troops at the drop of a hat. This expression alludes to being too eager to fire a gun. [c. 1940]

The adjective has 2 meanings:

Meaning #1: irresponsible in the use of firearms

Meaning #2: marked by extreme intensity of emotions or convictions; inclined to react violently; fervid
  Synonyms: fierce, tearing, vehement, violent

Look up trigger happy in Wiktionary, the free dictionary.

Trigger happy is an adjective meaning "too eager to shoot"

Trigger Happy may refer to:

• Trigger Happy (book), book by Steven Poole
• Trigger Happy TV, British television show
• Trigger Happy (film), 1996 film more commonly referred to as Mad Dog Time
• Trigger Happy (2001 film), 2001 film starring Daniel Von Bargen
• "Trigger Happy" (Weird Al Yankovic song), song by "Weird Al" Yankovic
• Triggerhappy, a Transformer

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