Top Definition
Disproportionate muscle growth in the arm used in masturbation, resulting in an "imbalance" of arm size.

Can be cured by using the weaker arm instead.
"Dude, check out my bicep! It's huge!"
"That's because you jerk with that one. Let's see the other one."

"I can lift a sofa with my masturbation arm. The other's just weak."
by funtakmonster January 26, 2012
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