a relationship that revolves completely around sex, so much so that the people are not even considered to be "in a relationship" but simply just hooking up. it is different from a one night stand in that it lasts longer than one night and at least one person feels an emotional bond that most likely isn't even there.
Girl #1: Joe and Kate really need to stop their sex-lationship and either start dating or stop fucking.
Girl #2: Seriously.
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.