If you drink till vomit does that cancel out the beers fattness?

No, vomiting does not cancel out the calories consumed from beer. When you vomit, you expel the contents of your stomach, including any undigested food or drink. However, the calories from the beer have already been absorbed into your bloodstream by the time it reaches your stomach. Vomiting may relieve some of the discomfort associated with drinking too much alcohol, but it does not eliminate the calories consumed.

In addition, vomiting can lead to dehydration and other health problems, so it is important to drink plenty of fluids and seek medical attention if you are experiencing severe vomiting.