Usually seen in online forums, where the easiness of Copy/Paste is abused, an info dump is used to deposit large amounts (usually entire articles) of information without summarizing or paraphrasing the information.
Anthony: Have you heard of the Flying Spaghetti Monster?
Dirk: Nope, what is it?
Anthony: *copy & pastes entire article from Wikipedia and About.com*
Dirk: Holy shit, keep the info dump to yourself!