To get better, develop, or improve.
Keep practising and you'll get grown in no time.
by mixnmash May 6, 2016
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To get busy with your lady i.e. to have sexual intercourse but call it something much more manly.
I'm bout to get my grown man on.

Quit being a faggot and get your grown man on!
by cake-etiquette December 16, 2008
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