Can a person eat their own poo?

no well it is completely disgusting and you would probably vomit but it is physically possible.

人食用自己的粪便是一种非常不卫生和不健康的行为，可能会导致严重的健康问题，包括感染疾病和中毒。所以，从健康和安全的角度来看，人不应该食用自己的粪便。