Coffee is a brewed beverage prepared from the roasted or baked seeds of several species of an evergreen shrub of the genus Coffea. It is a drink that people take to make them "hyped up". Like someone who jitters like a 9.0 earthquake.
Coffee is not recommended for RfA candidates, not that I actually drink it :P For some people, even a pinch of it is enough to get them all "worked up". If you are an RfA candidate, it is strongly recommended that you drink tea instead.