To undo a "Fuck You" previously done unto someone else.
Office Mate #1: "Boss told me to tell you you're fired."

Office Mate #2: "Fuck you!!!"

Office Mate #1: "...But I told boss that unless he told you himself, he should consider you employed."

Office Mate #2: "Okay, I take it back... unfuck you."
by Silver415 May 4, 2010
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A worse insult than "Fuck you." The previous implies that at least you'll get some. "Unfuck you" is a curse designed to ensure you don't get any at all.
Boss: You're fired
You: Yeah? Well Unfuck you asshole!
by Blooddraken August 13, 2011
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