Arr HN! I had a need for pirate themed insults for a D&D campaign last year and put together a generator using recursive templating. Generations are scored on a couple axes (vulgarity, viciousness, intelligence) so the output can be tailored to a particular situation. There isn't any AI at work here.

I have a new blog post with a lot more detail on how it works:

https://www.anardil.net/2023/pirate-insults.html