In response to the absence of chatter on this board, I offer the following words that cross my mind often when I am playing. Slang is only slang if "everybody" uses it; to my knowledge I have not heard these words used by others in a VP context.
Some of these may sound a little mean, but they aren't intended to be. They are just intended to be descriptive. Nor is anything supposed to be clever or funny, these are just the words that are in my head.
VERTICAL - sort of a measure of variance, based on how the game "feels" when you play. Double Double Bonus and Triple Deuces Wild are the most vertical games I can think of offhand. Basically in a truly vertical game you watch your credits drop almost vertically until something really good happens. Also can be used to described a run of bad or good luck on any machine.
SMACKY - nickname for the person who has to whack the buttons with ten times the force of anyone else playing in the casino. He or she usually moves on to another machine only after messing up the buttons on his or her machine first.
SURFING - When you insert a bill in a machine, and play for an extended period of time without getting too far ahead or behind, and without exhausting your credits. Like putting a $20 bill in and hitting a bunch of flushes and full houses in JoB, and noticing you are up ten bucks after an hour of play.
ACE-JUNKIE - A person who comes across a multi-game machine with ten options but will only see the button that says "Double Double Bonus". A true Ace-Junkie ignores any and all paytables as long as they have DDB up on their screen.
CORN - This word has two meanings:
1) A game with very -EV, or a bad paytable, such as 6-5 Jacks or Better
2) Any machine that you are having particularly bad luck on on a given day.
The metaphor behind this term is that the game or machine is a steaming ear of boiled corn, and your money is a stick of butter set out on the dinner table. Try and imagine what happens to the butter when the hot ear of corn is set down on top.
Does anyone have ones they'd like to share?