refers to anything really gross and repulsive. Nadsty also refers to a used Nad (or similar hair removal product) that is covered in clumped up pubes or other hair.
I went to pick up this bitch for a date, and when I went to the john to piss before we left I saw a nadsty pile in the garbage can that looked like a dead chinchilla.
by CapnCrouton May 13, 2004
by Brian Allan November 14, 2007