I thought the swearing vocabulary of American Gods was fairly rich, while I was writing it. I remember how much fun it was to write something like
“Fuck you,” said Czernobog. “Fuck you and fuck your mother and fuck the fucking horse you fucking rode in on. You will not even die in battle. No warrior will taste your blood. No one alive will take your life. You will die a soft, poor death. You will die with a kiss on your lips and a lie in your heart.”
…although it’s probably a bit heavy on the fucks for real richness in swearing.
I’ll try and swear more richly in the next American Gods novel.