Church-Bell is a Victorian slang phrase originally used to reference talkative women. Though slightly sexist at the time, the term usually now covers all genders.
“Your wife is a real church-bell when it comes to badminton.”
“So what? You're a real church-bell when it comes to knock-off pizzas and pirated movies, but you don't see me complaining.”
The use of the word "blue" to refer to sexually explicit content was first recorded in Scotland in 1824. "Blue" meant "lewd" because prostitutes dressed in blue gowns.