Source : WordNet®

barf
     v : eject the contents of the stomach through the mouth; "After
         drinking too much, the students vomited"; "He purged
         continuously"; "The patient regurgitated the food we gave
         him last night" [syn: {vomit}, {vomit up}, {purge}, {cast},
          {sick}, {cat}, {be sick}, {disgorge}, {regorge}, {retch},
          {puke}, {spew}, {spue}, {chuck}, {upchuck}, {honk}, {regurgitate},
          {throw up}] [ant: {keep down}]

Source : Free On-Line Dictionary of Computing

barf
     
        /barf/ [mainstream slang for "vomit"] 1.  Term of disgust.
        This is the closest hackish equivalent of the Val\-speak "gag
        me with a spoon". (Like, euwww!)  See {bletch}.
     
        2. To say "Barf!" or emit some similar expression of disgust.
        "I showed him my latest hack and he barfed" means only that he
        complained about it, not that he literally vomited.
     
        3. To fail to work because of unacceptable input, perhaps with
        a suitable error message, perhaps not.  Examples: "The
        division operation barfs if you try to divide by 0."  (That
        is, the division operation checks for an attempt to divide by
        zero, and if one is encountered it causes the operation to
        fail in some unspecified, but generally obvious, manner.) "The
        text editor barfs if you try to read in a new file before
        writing out the old one".
     
        See {choke}, {gag}.
     
        In Commonwealth Hackish, "barf" is generally replaced by
        "puke" or "vom".  {barf} is sometimes also used as a
        {metasyntactic variable}, like {foo} or {bar}.
     
        (1996-02-26)