The feeling that you are doing something that you've already done before. Literal translation "already
seen" (from
French, deja 'already', vu 'seen'). Apparently it'
s due to a blip in your
brain process which gives you the illusion that you've been somewhere/done something before, and technically, you have - a fraction of a second ago.
However, a common misinterpretation of deja vu is a repeat of a certain event. For example, in an episode of Garfield and Friends (US Acres) Orson perpetually removes the same book (Deja vu: the feeling that you are doing something that you've done before) from a box of
books over and over again. This is NOT deja vu; rather, it's an event that doesn't have a forseeable end: an infinite
loop, if you will.
If you
walk into a room and immediately get the feeling that you've been there before, then that is a case of deja vu.
When i stepped out the door and looked at the
sky, i immediately felt like i'd forseen this. wow, deja vu. looks like its going to be a very
interesting day...