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A motion of shaking one's fingers above one's head when a verbal exclamation would not be appropriate. Similar to spirit fingers and jazz hands.
General Assemblies at Latin Convention are known to be unbearably long, so, as to ameliorate the time situation, the silent cheer is implemented.

Those who practice the silent cheer are far nerdier than most.
by Chemiosmotic November 30, 2006

Words related to silent cheer

jazz hands latin convention spirit fingers gesture spirit