Doing a fart whilst sitting on the toilet.
"I thought I needed to do a dump, but instead i just did a fart" "Man you've just done a royal fart!"
Royal Fatigue is the feeling of exhaustion from experiencing lots of royal events within a short period of time.
For example, in the past few years in the UK, we’ve had a
Prince Philip’s Funeral
Platinum Jubilee
State Funeral
Coronation
We literally can’t be arsed with anymore royal events hence royal fatigue.