Jazz Hands!
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"Jazz hands!" is used to refer to a person holding his/her hands out (usually to the side) with the palms forward and fingers spread wide, a position refered to in dance as, well, "jazz hands." See Bob Fosse for multiple examples of jazz hands choreography.
This was a common riff on MST3K, usually delivered in a, shall we say 'jazzy' voice when somebody either assumed the jazz hands position, or looked as if they might.