1. (verb)vomit, vomitus, puke, barf the matter ejected in vomiting
2. (verb)vomit, vomit up, purge, cast, sick, cat, be sick, disgorge, regorge, retch, puke, barf, spew, spue, chuck, upchuck, honk, regurgitate, throw up 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"
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 latesthack 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 divisionoperation barfs if you try to divide by
0.” (That is, the divisionoperation 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 texteditor barfs
if you try to read in a new file before writing out the old
one.”
Definitions of barf 
