RTFM is an initialism for the expression "read the fucking manual" or more in the context of the Unix computer operating system, "read the fucking man page".
RTFM is usually expressed when the speaker is irritated by another person's question or lack of knowledge.
A design featuring the well known acronym RTFM printed in all-caps in a black, Western style font. The design is available on different products, such as stickers, phone and tablet cases and laptop sleeves. For apparel such as shirts and hoodies different colors can be chosen.