A similar thing happens when the word "password" is present in the file. Copilot stops autocompleting.

I haven't tried this yet, but I wonder if putting a comment at the top saying "the term ass refers to…" would convince copilot that you're not being profane.

I've also been a user since day one and other than that "safety feature" it's been such a fantastic addition. I turned off intellisense because copilot does a much better job (more accurate, longer auto completions) albeit with slightly increased latency