Can mean either "go fuck yourself" or "good for you", both usually in an offensive manner.
First Meaning:
Person 1: "Hey!"
Person 2: "What do you want?"
Person 1: "GFY!"
Meaning 2:
Person 1: I got an A on my test, everyone!
Person 2: GFY *rolls eyes*
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One who is depressed or sad, usually for no specific reason.
Person 1: Adam looks really sad.
Person 2: Yeah, he's being a mopey grape.
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