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: "
BALL UP!!"
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!"