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/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.
References in periodicals archive ?
If you can cut through all the gratituous PG-13 booger eating, barfing, flatulence, nipple-twisting, old men whipping out the middle finger and other questionable sight gags involving midget bashing and men-eyeing-men, the flick actually has a somewhat decent message.
The Act would eliminate more than 200 state food safety and public health protections, by barfing state rules that impose stronger standards for food safety or that require stronger warnings than mandated by federal law.
Sky discovers the dead pet after barfing into flowering shrubs and expresses her pain in melodramatic, wailing denial.
The pathos of her condition is real, but gay jokes, offhand scatology and a barfing walrus leave the movie in the world of the Farrelly brothers.
In addition to unspecified damages, the suit sought a judicial declaration that the pro-lifer's constitutional rights of free expression and peaceable assembly had been violated, and an injunction barfing PPCT from denying pro-lifers future access to the library.