1. noun: General term describing someone of partial Irishdecent who enjoys giving women (that don't actually want to date him) bruises. Typically the O'Fallon can convince any woman with low self-esteem that they should have sex with him, simply because they they are too afraid to say no. An O'Fallon usually has sex lasting no longer than 11 minutes. This is beneficial to the O'Fallon, since it never sees only one woman at a time. After sex, the O'Fallon's catch phrase is usually "This just isn't a good day for me."
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).