Short for: shut the fuck up dumb ass. Used on internet sites where people get annoying, or even when talking to a friend about someone you don't agree on. (religion for example)
Internet Example:
Person1: I am better than all of you because i was hte second person to join
Person2:stfuda
Friend:
Friend1: The big bangnever happened.
Friend2: stfuda it did
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).