When two friends gently rest their cocks(2) and balls(4) upon the shoulder of a roommate's girlfriend. She must gaze foward at all times as for it not to be constituted as cheating.
Example: I am appalled that Mike and Mike were "Shoulder Padding" Amber last night, exclaimed Marc.
When a man sneaks up behind an unsuspecting victim and calmly rests his nutsack upon the victim's shoulder. Properly executed Nigerian shoulder pads result in the slow turning of the victim's head, followed by a double take, followed by either anger, disgust, or cautious acceptance.
Example: I was thoroughly enjoying my meal at Outback Steakhouse when I realized that the waiter had outfitted me with a pair of Nigerian shoulder pads.