To hire someone to beat up, or kill someone else.
(You can also use this term sarcastically to show your protective tendency for your significant other)
Girl: looser's name here is being such a jerk.
Guy: Do you need me to "call a hit" on em?
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.