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To eject something from one's stomach by vomiting. A noun or pronoun can be used between "vomit" and "up." Thankfully the dog vomited up most of the chocolate, so it didn't make him too ill. I nearly vomited my dinner up riding on that roller coaster!
vomit something up
to bring up something from the stomach by vomiting. The dog vomited the chocolate cake up. Fido vomited up the rabbit.
To eject some contents of the stomach through the mouth: I vomited up my dinner. The bird vomited the worm up for its young.