WordNet (r) 3.0 (2006):

barf
    n 1: the matter ejected in vomiting [syn: vomit, vomitus,
         puke, barf]
    v 1: 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, barf, spew, spue, chuck, upchuck, honk,
         regurgitate, throw up] [ant: keep down]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "barf":
   be nauseated, be seasick, be sick, bring up, cascade, cast,
   choke on, chuck up, disgorge, disgorgement, egest, egesta,
   egestion, feed the fish, feel disgust, gag, gagging, heave,
   heave the gorge, heaves, heaving, keck, nausea, puke, regurgitate,
   regurgitation, reject, retch, sick up, sicken at, spew, throw up,
   upchuck, vomit, vomiting, vomition



The Jargon File (version 4.4.7, 29 Dec 2003):

barf
 /barf/, n.,v.

    [common; from mainstream slang meaning ?vomit?]

    1. interj. Term of disgust. This is the closest hackish equivalent of the
    Valspeak ?gag me with a spoon?. (Like, euwww!) See bletch.

    2. vi. 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. vi. 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. In Commonwealth Hackish, barf is generally replaced by ?puke?
    or ?vom?. barf is sometimes also used as a metasyntactic variable, like
    foo or bar.


The Free On-line Dictionary of Computing (30 December 2018):

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)