1. n. The act of combining masturbation with mutilation. The word is a combination of the words Masturbate and Mutate, although mutation is not part of the process.
"That guy is so badass. I heard he Masterbutates."
"Holy shit, masterbutation just scares me. Call me a bitch, but I just don't think I could do it."
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).