rude slang An initialism of "read the fucking manual," an exclamation of frustration and exasperation directed at someone who has asked a question or series of questions that have already been answered in the manual for something. Would you stop asking such boneheaded questions and just RTFM? I don't have time to hold your hand on every project we do. I don't understand how you could be having so many problems installing the software. RTFM, dude.