A person's metaphoric wang, the size of which being related to his apparent devotion to the environment via principles, purchases, lame t-shirts and bumper stickers, etc. "Green" comes from the color commonly associated with environmentalism, and "peen" is short for penis. Duh.
While Ryan greatly enlarged his greenpeen by purchasing a Prius, Sean's HighlanderHybrid provided a decent enlargement while also allowing him to keep his dignity.
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).