[header] How to vomit politely [title] When you have to vomit, say you have to use the restroom, and go vomit in the toilet. [step] Then flush the toilet and wipe your mouth. If there is a water fountain nearby, you would probably want to get a drink. 
[title] If no restroom is available, ask to be excused. [step] Then, leave to find a bush, tree, rock or anything big that you can hide behind.