What is Brazilian Fart Porn?

I had no idea such a thing existed until I wented to Hotmovies (pay per view movie site) and noticed a couple Brazilian Fart Porn videos.  I was like, “what the fuck?”.  Evidently, these are movies of women farting in guy’s faces (or women’s faces).  I guess I should not criticize other people for their sexual fantasies, but I have to admit this seems funnier than it is erotic.  Chicks farting? Hot? And why from Brazil?  Are these women especially gassy?  This is one niche I can’t quite figure out (and there are plenty more equally perplexing), but hey, at least it was something new and somewhat comical, and I don’t run across that too often.  And if you haven’t ever heard about it, now you know.