Cannibalism is taboo in most human societies; most people would find eating human flesh to be intolerable. Therefore, a dream that you are a cannibal can mean that you have taken in information that you find extremely distasteful and that you cannot tolerate, or that you have been exposed to what you believe to be inappropriate behavior.
A dream that you are a cannibal can be a message that you have accepted information that is incorrect.
Being a cannibal in a dream can also symbolize a need to accept a part of yourself that you are not happy with or do not understand.
If you dream that you are eating the flesh of someone you know, you may desire to acquire some of their qualities, or you may be worried that you have already adopted some qualities of theirs that you do not like.
A dream that cannibals threaten to eat you, or that you are being eaten by cannibals, can mean that you are feeling torn apart by responsibilities.