from
Jargon File (4.4.4, 14 Aug 2003)
RTFB
/R.T.F.B/, imp.
[Unix] Abbreviation for `Read The Fucking Binary'. Used when neither
documentation nor source for the problem at hand exists, and the only
thing to do is use some debugger or monitor and directly analyze the
assembler or even the machine code. "No source for the buggy port
driver? Aaargh! I hate proprietary operating systems. Time to RTFB."
Of the various RTF? forms, `RTFB' is the least pejorative against
anyone asking a question for which RTFB is the answer; the anger here
is directed at the absence of both source and adequate documentation.