A set of finely crafted male undergarments, usually made of the finest silk (or some other very comfortable material for your nuts to rest in). Nut ushers firmly cradle your junk, but also hold them with the tender caress of a woman's supple hand. This is so the "boys" (your balls) stay on the reservation and dont go wandering off.
Basically, Nut Ushers keep your balls in order and in their proper location, while maintaining comfort.
Ex1: Devin bought the sweetest 4 pack of nut ushers from The Gap yesterday. He looks so happy.
Ex2: These nut ushers I picked up at the market yesterday allowed me to walk in comfort without my underwear ripping out my pubes, or forcing my balls above my shaft in a mishmash of sweaty meat and kidney bean casserole. Happy birthday me!