A gesture in which the hand is held with the palm facing forward and the fingers splayed (often while waving rapidly back and forth), usually performed as part of a dance routine; chiefly in plural.
Origin
1970s.
Definition of jazz hand in US English:
jazz hand
noun
A gesture in which the hand is held with the palm facing forward and the fingers splayed (often while waving rapidly back and forth), usually performed as part of a dance routine; chiefly in plural.