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1.
An instruction that should be given when a request is made that one performs some request that is currently out of one's capacity or willingness to execute. Particularly apt if the requestor has a genuine grievance. Can be prefixed with the word 'Go'.
Andrew : We'll have to stop smoking cigarettes in here because the smoke is giving Wayne a sore throat.

Dan : Eat a dogshit, Wayne
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Person a : Can you give me back that fiver I lent you?
Person b : Go eat a dogshit.
by o-corny April 03, 2010