The Brief: FTFY is an abbreviation for "fixed that for you."

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Popular on Reddit and Twitter, the acronym FTFY means “fixed that for you.” While it can be used as a sincere way to be helpful, it’s more often meant to sarcastically correct someone or share an opposing opinion.

On Twitter, people will reply to a tweet that they disagree with, rephrasing it to have a different meaning, and signing off with “FTFY.” On Reddit, it may be used as a sly remark in comment threads.