Interesting. If you have a source for that, pass it to the OED, because their earliest recorded usage is for 1889, and they’re always on the lookout for earlier sightings of words.
Seiza posture. I learned that in my late 50s. It takes a while for your circulation to improve to the point where you don’t end up with pins and needles, but it becomes quite comfortable (especially if you ever get a chance to do it on a traditional Japanese mat). And – despite Bub – it automatically makes you keep your back fairly straight, so it’s good for your posture.
“My very own copy of the things you need to do today? How thoughtful. I’ll just sit here with this coffee and help you by ticking them off as you do them Would you like one as well?"
Ah – I see what you mean. “Bum fodder” cite is 17th century; “bumf” as an abbreviation is later. OK.