As a Noun: 1. Partly digested food and drink that has come back up from someone's stomach and out through their mouth. English = vomit. Informal English = chunder. 2. The act of ejecting food and drink from your stomach and out through your mouth, usually because you are ill. English = vomiting. As a Verb or Adjective: 1. To have food and drink come back from your stomach and out through your mouth, usually because you are ill. English = vomit, (be) sick. Idiomatic English = throw up. Informal English = chunder.