Source : Free On-Line Dictionary of Computing

RTFS
     
         1. Read The Fucking Source.  Variant form of {RTFM},
        used when the problem at hand is not necessarily obvious and
        not answerable from the manuals - or the manuals are not yet
        written and maybe never will be.  For even trickier
        situations, see {RTFB}.  Unlike RTFM, the anger inherent in
        RTFS is not usually directed at the person asking the
        question, but rather at the people who failed to provide
        adequate documentation.
     
        2. Read The Fucking Standard; this oath can only be used when
        the problem area (e.g. a language or operating system
        interface) has actually been codified in a ratified standards
        document.  The existence of these standards documents (and the
        technically inappropriate but politically mandated compromises
        that they inevitably contain, and the impenetrable {legalese}
        in which they are invariably written, and the unbelievably
        tedious bureaucratic process by which they are produced) can
        be unnerving to hackers, who are used to a certain amount of
        ambiguity in the specifications of the systems they use.
        (Hackers feel that such ambiguities are acceptable as long as
        the {Right Thing} to do is obvious to any thinking observer;
        sadly, this casual attitude toward specifications becomes
        unworkable when a system becomes popular in the {Real World}.)
        Since a hacker is likely to feel that a standards document is
        both unnecessary and technically deficient, the deprecation
        inherent in this term may be directed as much against the
        standard as against the person who ought to read it.
     
        [{Jargon File}]