look up any word, like half chub:
 
1.
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
 
2.
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