There are phrases we use to tell a person to go do something, elsewhere, away from us, that might cause injury or misfortune. There is not necessarily an expectation that they will do the thing. It is mostly meant to reinforce that the person is not welcome, and invites them to occupy their time somewhere else.
Examples:
"go take a hike", "go pound salt", "go fly a kite in a thunderstorm", "take a long walk off a short pier", "piss off", "go to heck", etc..
Is there a word to describe this type of statement? Was thinking something like 'antagonistic imperative'?