I am reading the '1811 dictionary of the vulgar tongue' it includes dirty and slang talk from England, from sailors criminals and university students.
It claims to give the secrets of the latest terrible words, so that young men can use them with confidence around parents and even girls(!) and remain undetected!
A lot of times these compilations are a disappoint, but this one is jaw droppingly inclusive, and full of all kinds of things that are absolutely relevant to me.
(When Bush says Wellard does not know the bob-stay from the spanker-boom he is also saying W does not know his ass from his frenulum.)