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To overcome your fear, to act despite your fright and show some confidence by being a man.
When you are scared to walk over to that pretty girl your friend tells you to get your balls up.
by natralman March 11, 2007
Get big... grow a pair... saying this to someone means to toughen up and do it
"Joe: I don't want to go down the slide."
"Sally: Cmon Joe, get your balls up!
by Carloneedstogethisballsup October 16, 2008