You must hit them with Old Reliable:

Just dematerialize

You can just hit the bricks. You're an adult. Nobody is stopping you.

I just tell them I have to use the bathroom. I just don't tell them it's at home.

i like to tell everyone I'm making an Irish goodbye because that's what the Irish would do

That’s funny! Do you say “an Irish goodbye” in English when someone leaves without saying goodbye? In German, we say “einen polnischen Abgang machen”, which literally means “to make a Polish exit.” (Apologies to my Polish friends!)

Edit:

Just learned international Names for it:

Germany: Polnischer Abgang (Polish exit)

United States & Ireland: Irish goodbye

United Kingdom: French exit

France: filer à l'anglaise (to leave the English way)

Poland: wyjść po angielsku (to leave the English way)

"My planet needs me"

https://www.youtube.com/watch?v=hUzxYZR_puo

maybe it's time to get going...

"I'm off! Bye!"

Flo & Joan - Irish Goodbye