Verb: to motorboat someone's ball sac as though it were a woman's cleavage. Scrotorboating is not exclusive to the nuts, and can even include said activity on someone's taint.
Taking a picture of your nuts on a friend's cell phone and setting it as their wallpaper. The next time they open their phone they have a virtual teabag.
"I gave Cindy a scrotorola. Somebody call her and make her pick up her phone..."
The study and application of the physics behind the action, use, and movement of the scrotum. A new and hopefully fast spreading application of science to be used in the aid of both athletic and non athletic use. Made up by Torbjorn at Pennsic 38
"Dude, why you walking like that?"
"I just got a new cup, the scrotodynamics were wrong and it chafed."
"Bummer."
or
"Due to scrotodynamics, we now know that you have to receive a vasectomyif you want to remain able to walk Mr. Bob"