This is a pun on episodic memory created by Ulric Neisser (Psychologists make puns! Who would have thought...) to describe recalling events that never really happened, but are close to events that happen often. When referring to a schema of common events, people sometime mistake the more average 'ideal' of their actions as a real happening.
For example, while I think I remember eating turkey for dinner Christmas before last, I don't really trust that memory. I generally remember having had turkey for every Christmas, but I know that I actually did not have turkey every time. My memory of Christmas-dinner-before-last may be a repisodic memory.
Maybe I need to work on my Metamemory.