Perth Amboy Switchoff
When you're getting a fantastic hand job and your partner's arm gets tired so they start using the weak hand instead...
"I was looking for some sweet Western Grip action, so I called a couple buddies over. One of them starts strangling the soldier. A few minutes go by and my buddy gets fatigued, so a buddy of mine switches arms! I said 'wait a second, pal! nobody gives me the old Perth Amboy Switchoff!'