[1] : WordNet (r) 2.0

upchuck
     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, barf, spew, spue, chuck, honk, regurgitate,
          throw up ant: keep down
see also:
vomit vomit up purge cast sick cat 
be sick disgorge regorge retch puke 
barf spew spue chuck honk 
regurgitate throw up keep down 

[2] : Moby Thesaurus II by Grady Ward, 1.0

24 moby thesaurus words for "upchuck":
   barf, be nauseated, be seasick, be sick, bring up, choke on,
   chuck up, disgorge, egest, feed the fish, feel disgust, gag, heave,
   heave the gorge, keck, puke, regurgitate, reject, retch, sick up,
   sicken at, spew, throw up, vomit

Upchuck >> U Words
Upchuck, definition of term: Upchuck
upchuck_pag1.html