on the spur of the moment

1 definition found

on the spur of the moment - WordNet (r) 2.1 (2005) :

  on the spur of the moment
      adv 1: on impulse; without premeditation; "he decided to go to
             Chicago on the spur of the moment"; "he made up his mind
             suddenly" [syn: on the spur of the moment, suddenly]