eidetic

Basically, the condition of having a photographic memory. Can also be used to describe any kind of advanced memory skill/abilty/condition (depending on the circumstances of attaining a photographic memory).

Eidetic means to have an extraordinary memory, like taking a snapshot of a long piece of text and being able to recite it word for word. Different to photographic memory, where it's more people just saying they can do it when they can't. Eidetic is the science; photographic is the myth.
People also tend to assume that being eidetic means you "cheat" in tests. If you are an Eidetiker (eidetic person) all I can say is get used to it. You know that game where there are ten objects on a tray, and it gets covered up after 30sec and you have to remember what was on there? We used to play that game in my family at Xmas but I was banned from playing it when I was 6 because my memory was better than anyone else's in the room, which made it unfair (apparently).

State of memory and mind where you know everything ever seen, felt, heard, etc., but do not know how to access it, thus making your thoughts very random, as it just spits out random memories, thoughts and musings. To own one makes you very intelligent, yet also very stupid and random. People with a void eidetic mindset are typically very entertaining to be around, as one minute they will hold a deep philosophical conversation with you, the next they'll be acting like the biggest idiot you may know.