Wiktionary
up yours
interj. 1 (context idiomatic offensive markedly vulgar English) (non-gloss definition: Expression to show discontent with the other party, or to show contempt.) 2 (context idiomatic dismissive offensive markedly vulgar English) Go away! Go to hell!
Usage examples of "up yours".
But thinking of Nixon made him remember the triumphant moment when Nixon said Up Yours to the North Vietnamese and bombed the hell out of them and got them to the negotiating table that one last time.