A figure of speech which implies that you must be thoroughly prepared before engaging in a certain event. Usually, factors such as health physical stamina and mental state fall into what could be considered a "normal" state. however when the term eat your wheaties is directed at you this is done to inform you that to compete you must supercede normal levels of functioning.
The other day some guy at the bar told me that he could beat me in darts and i told him child please u better eat your wheaties.
While on descent from a vicious posterizing dunk, blake griffin muttered eat your wheaties to the unfortunate fool below him.