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Maddy Muscle is the nickname for your shoulder muscles that look like they were hit by a truck. It got the name because a girl named Maddy had the biggest ones ever.
Hey Maddy, your Maddy Muscle is flexin' so hard I think it’s gonna pop!
I saw your Maddy Muscle in the mirror and I nearly fainted.
You got Maddy Muscle? I got a sore neck from lookin' at it.