Typing shortcut for a turtle emoticon on MSN Messenger. So if you type (tu) in the box and press enter, a small picture of a turtle will appear. I think it only works on version 6 or higher though.
(On an MSN convo)
Harry: What's your fave animal?
Elaine: A turtle!
Harry: What do they look like then?
Elaine: (tu)
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).