In old English, the word "privvy" would've been used as a shorthand term to refer to toilet. For example, "the Privvy Council" of Henry VIII and the like, would've had the blessed duty of cleaning up after the guy did a shit. Now, it can also be used in slang as a teasing nickname for those who are so lucky as to attend, private education.
Person 1: You're so incompetent, you belittle freak!
Person 2: Oh shut up, Privvy Boy!
Person 1: My Father will hear about this upmost outrage!
Person 2: Oh shut up, Privvy Boy!
Person 1: My Father will hear about this upmost outrage!
by sarcasticnarwhal October 11, 2018
your private parts
by BedBunny November 17, 2003