A tennis elbow type condition caused by excessive, frantic masturbation while viewing porn or frantic, fast masturbation caused by lack of privacy (in dorm room, in men's room at work, etc). Once the condition sets in on one arm, the jerker often switches to the other, to rest the arm which is suffering.
The porn jerker thought that the ice pack might ease his jerkoff elbow pain.
A very complex machine utilizing a combination of torsional motion and varying stresses and strains, implemented by a complex system of pulleys and hydraulic levers. The system, operating at an astronomical 72% efficiency, is perfect for thermodynamic calculations, maximizing the output of the internal combustion engine, cooking eggs, and jerking off chodes.
Dude1) "Did you finish calibrating the hydrolic pressure meter on the jerkoff-mobile?"