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"RTFM" is an acronym that stands for "Read The F***ing Manual."
It's often used informally to suggest that someone should read the documentation or manual of a product, software, or system before asking questions or seeking help.
The use of strong language in the acronym can sometimes be seen as humorous or sarcastic, but it generally conveys the idea that the information being sought is readily available in the provided documentation and that the person should take the initiative to find it themselves.