What comes out of an old man's testicles when he ejaculates.

(n.) the dust-like crumb left at the bottom of a nut container

(slang) Common term in anarchist-vegan circles for nutritional yeast (a vegan condiment).

Nut dust is dust/dead skin/or glitter coming from the nuts/balls

the dusty substance that can occur around the male genitalia due to lack of use and hygeine

The think sludge substance that is in you mouth after you eat a large amount of nuts (almonds, walnuts, almonds, peanuts, and the famous cheddar cheese nuts). - Matty Mary

The act of talcing ones nuts on hot days for comfort.