Hosting a roast is an event where a person or group of people are the center of attention and are made fun of in a humorous way. The term 'host a roast' comes from the traditional cooking method of roasting meat over an open fire. An EMCEE is the person who is responsible for introducing the roastee, setting the tone of the event, and keeping the audience engaged. The EMCEE is also responsible for introducing the other speakers and ensuring that the roast runs smoothly.