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..."