It's when you leave your hand on your balls for a while then take your hand off of them and touch someone; either shaking their hand, slapping their face, etc. So just like second hand smoke the person on the recieving end of this will be second handedly touching your nuts.
"Dude today Cory really pissed me off, so I had to give him the old Second Hand Testicle Touch!"
by Baldy's Balls November 21, 2005
Can you define these popular missing words?