Another name for masturbating which is used as a joke or as a way to say it around other people without them knowing. This can get confusing when one person is actually taking a calc course. It must be used in entirety meaning calculus work and calc cannot be used in this way.
Dude - I really need to do some calculus tonight
Chick - So have you done your calculus yet?
Dude - Nope, you want to do some with me?