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A guy who acts like a dog, usually because he got caught cheating and now he's begging for forgiveness with a face like a kicked puppy.
'You're an M dog now. I'm gonna feed you kibble and let you sleep on the floor.'
'He's an M dog. I'm gonna make him wear a collar and fetch my slippers.'
'You're such an M dog. I'm gonna put you on a leash and walk you around the block.'