How to pronounce “poof”(verb) in English

And before I could even open my mouth, part of his crew had gone under and they were pushing the sides of the balloon up because it helps itfill up with air faster and poof it out and I saw that I just started snapping away and I couldn't believe my luck. And it's definitely one of my best pictures,I think, because it speaks on a lot more levels than just ballooning or people or whatever. I'll go more into that here a little bit later.