Nut day is the day that celebrates ejaculation, the action of stroking ones penis to cause an orgasm that sends a white liquid to shoot out called sperm, semen, cum etc., and is celebrated on October 22nd every year.
some dude: "dude what day is it?"
some other dude: "its Nutday dude!!"
some dude: "Hell yeah."
synonyms: Halloween, All Hallow's Eve. An American holiday celebrated on October 31 for which women, particularly of the college-going age, dress like sluts by wearing themed costumes.
See "slutty Halloween costume formula."
My girlfriend bought a great French maid costume for National Dress Like a Slut Day; mini-skirt, fuck-me pumps, and fishnet stockings.