on impulse

on impulse

Done with recklessly or impulsively, without due thought or consideration. I had always wanted a classic muscle car, so after getting the payout from my insurers I decided to buy one on impulse. I understand that you're dissatisfied with your job, but don't just quit it on impulse—have a plan in place first for what you're going to do next.
See also: on
Farlex Dictionary of Idioms.

on impulse

after having had an impulse or sudden thought. On impulse, Bob decided to buy a car. I didn't need a cellular telephone. I just bought it on impulse.
See also: on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • snap decision
  • throw money at something
  • snap judgment
  • not think twice about (something)
  • pull a muscle
  • shoot from the hip
  • fire from the hip
  • hip-shooter
  • on the spur of the moment
  • go snaky