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balls to drop is a term for lack of courage. A reward for an act of courage your "balls could drop". Turning you from a boy to a man.
Steve: I am not going to jump off the diving board. I don't even know how to swim.

Ryan: Come on man, get those balls to drop.

Steve (jumps and swims): that wasn't too bad, I did fine.

Ryan: Congratulations, I think at 45 years old, your balls have officially dropped. Your voices sounds deeper too.
by Mitchell man September 03, 2010
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