An expression that's said when a male's genitalia (namely, their testicles) reach maturity. In colloquial terms, when "the balls drop". This term is said when such a moment occurs for a male, typically when among a group of his male friends.
Dave: "Happy New Years!"
Steve: "Nigga what the hell was that for?"
Tony: "Don't worry about it, his balls just dropped" *slow claps*
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