jazz hands

American  

[jaz handz] / ˈdʒæz ˌhændz /

plural noun

1. especially in modern jazz dance, a movement in which the performer displays forward-facing palms and fully splayed fingers, usually with the hands waving rapidly: adopted in general as a spirited gesture of enthusiasm.

   I want perfect mastery of all the steps in this number before we move to the upper limbs, so keep your jazz hands to yourself.

   Excuse my parents—they were cheerleaders in college, so their jazz hands come out whenever they’re excited about something.

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Etymology

Origin of jazz hands

First recorded in 1920–25, for an earlier sense