Definition
When someone doesn't agree with your opinion, they may use SFY to mean "speak for yourself." This reply means that, while what you've said might be true for you, it definitely isn't true for the person with whom you're talking.
Origin
slang.net
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See “SFY” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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Dabarrasing
To be disgusted and embarrassed....