Information that is placed into somebodies subconcious during the time of a dream. This information is acknowledged and accepted by the person dreaming where in reality someone would normally question it.
Guy1: Dude! in my dream me and my girlfriend were attacking this demon guy and omg it was just so unreal.
Guy2: but dude, you don't have a girlfriend.
Guy1: yeah, I know.
Guy2: well, wtf then?, don't you find that kind of strange?.
Guy1: nah dude, it was the dream data you can't deny that shit.