on a whim

Based on a sudden, impulsive urge, desire, or idea; without careful planning or because of a capricious inclination. On a whim, we drove to the beach for the weekend. Major governmental policies cannot be decided on a whim; they have to be carefully and rationally thought through.

See also: on

See also:

for the hell of it
have a taste for (something)
lose (one's) appetite for (something)
get a taste for (something)
a taste for (something)
taste for
on the spur of the moment
crack the whip
trigger
an itchy trigger finger

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