RTFB

RTFB /R-T-F-B/ imp.  [UNIX] Acronym 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.