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The embarrassing lecture your dad or some guy gives you when you're getting a little bigger and starting to smell like a gym sock.
Dad: 'You're getting a little bigger. I saw you in the mirror. You need to start acting like a man.'
Uncle Steve: 'You're gonna need to learn how to deal with girls and not just run from them.'
Your friend's dad: 'You're gonna be a man someday. You better start acting like one now.'