A question that is posed to a person who is telling a story or asking a question that makes no sense, or doesn't appear to have an ending. Does not specifically have to be used on the telephone.
So he was like driving, then his mum called, and she told him about the washing machine, and there was a huge tree in the park, and his brother was playing football
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.