Dating from one of the wars of the last century, a recommendation to "explode brown" is a request to stuff a grenade up your own ass and pull the pin.
"Harry, you worthless git! When are you going to explode brown and save the Jerries, or your own men (should they be so brave), the trouble of putting you out of our collective miseries?"
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).