Jacker's Arm
Your arm is so broken from too much hand action it looks like it got run over by a truck. You're basically a one-armed monster.
I can't even brush my teeth. My arm is like a dead fish. Jacker's Arm.
My arm is so weak I can't even open a soda can. Jacker's Arm is my new best friend.
I tried to wave at my friend and my arm just flopped. Jacker's Arm.