Acronym for What the Freak Did I Just Watch? An exclamation after viewing something that makes little or no sense. In less polite company, one can substitute an f-bomb in for word "freak".
Via instant Message:
Your Friend: Dude, check outthis vid: (some youtube link)
You: WTFDIJW?
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).