Have you ever wondered why some say “Pardon my French” before swearing? Me neither. But to fill space I am going to tell you.
The phrase got its origin in the early 1800s in England people would “beg pardon” for using French words in conversation. Forgiveness was requested in these instances because most people did not speak French, and furthermore, the Napoleonic Wars had left bad blood between the two countries. By the mid-1800s the phrase had evolved to refer to swear words, especially when you really didn’t care if they pardoned you or not.
In the United States it morphed into an insincere apology a man would say when, while making out and sticking his tongue in his dates mouth for the first time, he was met with a resounding “Ewww, that’s disgusting!.”
I don’t know if the last part is true but, being the romantic that I am, I hope so!