What is Grow Balls?
1.
Command to someone (not necessarily male) to show a bit of backbone.
Nicole's re-landscaped the lawn with forty different awkward pieces of sculpture and you're worried because she's threatening you with all kinds of bullshit if you don't mow it for her. For heaven's sake, Jimmy, grow balls!
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1.
It's a saying basically for someone to stop saying that someone is "stupid" because they are probably right behind him/he..