That ain't too weird. To someone without the same fetish, it's just plain funny.
Check out the cakefarts website (I love the girl's comment, "Okay, let's get this done.") and just Google "fart fetish." Brazil seems to be the fart fetish center of the universe (if there is such a thing), so you'll see a lot of videos from there. I like when the girl leaning into the farting girl's ass gets her hair blown around by the escaping gas.
It may not be my thing per se, but as long as its Safe, Sane and Consensual, it's all good in my book.