If you know that “to fuck” a person is to have sex with him/her, you automatically understand that a fuckable person is one that you would like to fuck. Accordingly is an unfuckable person a person that you don't want to fuck at all. A refuckable person is a person you would like to fuck again, while an unrefuckable person is one that you don't want to fuck again. You know the meaning of all these words by virtue of your knowledge of the individual morphemes fuck, re-, -able and un- and the rules for their combination.
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).