God rot them old-fashioned slang
God rot you for your action at school today.
God rot it! I forgot my key at home.
Used to say that you would like to do something, typically because of annoyance or irritation
Used to refer to a source that causes persistent annoyance or irritation
Someone or something annoying
If someone has a face like a wet weekend, they look miserable.
be unhappy, disappointed, heartbroken.
This expression is a minced oath.