English

Noun

vitamin O ‎(uncountable)

1. (slang) Oxygen.
2. (slang) Orgasms.
   • 1997, Meredith Maran, Notes From an Incomplete Revolution: Real Life Since Feminism‎, p. 74:

     The men I said yes to went home to their old ladies whistling a happy tune, high on vitamin O, relieved because I never hassled them when they said they couldn't spend the night.