The horrible smelling mixture of sweat and nastyness that accumulates between a mans ball sack and taint. When guys stick their hands in there pants and then smell it they're testing the flavor of their nut butter
from greek origins it describes the stuff that is born in your ballsack and often times ends up in ones hand, mouth or in certain cases asshole and vagina
or semen
What a stripper told my dad that she enjoys. She said "I don't like it when guys wash up the area between their balls and ass too well because it gets rid of their nut butter and I like a little nut butter."