Pudendum was the word used by medieval anatomists to refer to external genitalia, specifically female external genitalia, AKA the VULVA.
Pudendum is from the Latin 'pudenda' meaning 'to make ashamed' or 'the shameful part of something'.
The reasoning for why the anatomists associated the vulva with shame is: Women's genitalia is tucked away between the legs, whereas men's genitalia faces forward and outward. So this must be because women's genitalia is supposed to be hidden. And why would men's be on show but women's hidden? Because women's genitalia are shameful, duh.
Obviously there are in fact clear biological reasons why male and female genitals are arranged in the way in which they are, and it has nothing to do with shame you stupid medieval anatomists.