Masturbation forearms are caused by excessive masturbation. They can be identified under two conditions:
1)When one's forearms are disproportionate to eachother
2)When one's forearms are disproportionate to their upper arms (Think Popeye)
"Dude, I think you've got muscular forearm syndrome"
"What makes you say that?"
"You have masturbation forearms! You're right arm is bigger than your left!"
"...shit"
by Ano_Nymous February 28, 2010

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