Definition is dependent upon usage. it can be dirty when placed inside of sexually related sentences or it can mean when someone tries to bring you down or is hating on you.
Brittney: You're such an ass
Kerry: Yeah you're so mean
Phil: Why's everyone tryin to salt my seahorse
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).