1. a command by which someone tricks another at looking in the direction of the hand in an "OK" sign, by which the perpetrator must clench their fist to allow the fooling party to strike it hard in a slapping motion.
2. a general expression used when circumstances differ greatly from expectations
1. <person #1 holds up OK sign in the air>
<person #2 looks at it>
person #1: "BALL UP!!"
<person #2 hold out hand in clenched fist to be slapped>
2. guy 1: "Man, I thought for sure I was gonna get some tonight, but all I did was drop $50 on her dinner."
guy 2: "Oh, ball up!"
Prices shown in USD.
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