The level of which one is just too chill, lit, and savage that others must refer to them as chillitavage so you don't waste their time blurting out the words.
"Keef, Looks like you've got a bit of a chillitache going on there..."
"Where?"
"THERE!"
-puts chilli in moustache position and photographs quickly-
"ahh.... cheeky"
When some resigns or retires from a job, they are on "eternity leave". This can also refer to someone who has passed away, especially someone who worked somewhere for a long time, retired/resigned, then passed away later.
Oh I'm sorry, you didn't know that Kelly is on eternity leave? She resigned and moved to Hawaii!
With regrets I would like to inform you that my boss is officially on eternity leave. I will never see or hear them again. Ever.