Press F to Pay Respects: What Does F Mean Online?

Has someone ever replied to you with a single letter "F"?

What does Press F mean? Please Press F to Pay Respects

Press F to Pay Respects

Internet, smartphone and social media use around the world

remember that mom can I have an if statement meme here's a knockoff of it : r/ProgrammerHumor

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Press F to Pay Respects

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Press F to Pay Respects

All Due Respect: Press F for Farce