Phrase originating in Britain that is uttered by ravers/binge-drinkers when they are. Usually shouted repeatedly whilst loud electronica/techno/dance/rave music is blaring, and whilst the speaker is raving/dancing
"LET'S GO FUCKING MENTAL, LET'S GO FUCKING MENTAL, LET'S GO FUCKING MENTAAAAAAL!!!"
*smashes glass over own head rendering himself unconscious*
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).