slang A forceful expression of anger, dismissal, or contempt directed at someone. Can be used as a euphemism for "fuck you," meaning the same. I'm not cleaning up your mess! Forget you! A: "Did you actually think your singing sounded good there?" B: "Oh, forget you." I have every right to be here, so forget you!
Sl. Drop dead!; Beat it! Oh, yeah! Forget you! Forget you! Get a life!
exclam. Drop dead!; Beat it! (Possibly euphemistic for Fuck you!) Forget you! Get a life!