The answer is fucking no. No. A thousand times no. You can not, under any circumstances fart while getting head. Not only does that ensure some random chick will not continue blowing you, let alone tell every single girl she knows ensuring you never get blow'd down again except by that one slut that gets drunk and slurps ur'rything. But your girlfriend is going to A. slap the shit out of you B. dump you and C. go fuck your three best friends, possibly at the same time, out of sheer spite. It's also grounds for divorce.
I have blogged about Magary's ineptitude many a time, but recently he's been getting better. But this is inexcusable. "Yes its ok to blast a chicks nose off mid-knobber." Get real Bro. This ain't make believe. Your words have consequences.