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2.
an insult referring to your obvious manlessness. Has more meaning when said by a girl.
"I'm afraid of doing this."

"Grow some balls!"
by Grinning Assassin January 03, 2010
71 21
 
1.
to act more mature to be a man
I told him that he should grow some balls and tell me the truth.
by Ashers213 August 21, 2006
211 49