Folding. Just to clarify, I'm talking specifically about folding before putting any money (beside the ante or blinds) into the pot. I wasn't clear enough with that in my previous post.
I'll clarify a bit too. You get dealt two cards. When it's your turn, you play them. Maybe you fold, maybe you raise, whichever way you make a decision and play.
If you win every hand you play, you can't fold. If you fold then you played a hand and didn't win.
In the poker communities I've played with (and I'm by no means an expert), folding before putting any money in the pot would not be considered "playing" a hand (especially if you didn't pay a blind -- but even if you did).
