It is one of the most common phrases used at the poker table, and is a verbally binding phrase in most poker casinos. If you say I'm all-in  there is no further action you can take, and all of the chips in front of you are committed to the pot.

To pass  generally means to refrain from putting money into the pot when the opportunity presents itself. Most commonly players will say pass  to indicate that they are folding when they are facing a bet which they don't intend to call.

Outside of a poorly trained or bored dealer spinning the wheel and ball exactly the same, with exactly the same release, Roulette is random. You have a 5.26% chance of correctly picking an inside bet on a single zero wheel, 2.63% on a double zero wheel (Yes play the 0 wheel exclusively if it's available).