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Hard As a Motherfuckin' Grown Ass Man means you're so tough you could beat up a grown man and still have energy to laugh in his face.
DM: Bro, I just got out of jail and still went harder than you in the gym.
Tweet: My dog ran away and I chased him for three blocks. That's H. A. M. G. A. M.
Text: I woke up at 3 AM and still finished my workout. You ain't got no H. A. M. G. A. M.