The unignorable barely containable urge to take a crap.
For example: You and your mother hurriedly crossing a busy street to the nearest bathroom when she suddenly falls down as you see a bus in the distance quickly closing the gap between it and her. You scream an apology without missing a step asking the other pedestrians to please help her in lue of you trying to save her and shitting your pants in the middle of the road.
For example: You and your mother are hurriedly crossing a busy street to the nearest bathroom when she suddenly falls down and in the same instant see a bus in the distance quickly closing the gap between it and her. You scream an apology without missing a step asking the other pedestrians to please help her (in lue of you trying to save her and shitting your pants in the middle of the road). This would be a case of it being hard to give a shit when you have to take one.
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.