Should have told him it was a queef

Sounds like it’s time for you to teach him the classic: “You smelt it, you dealt it.”

USA, the only country on earth where females do not poop, pee or fart.... Did you know, holding in farts can harm your intestines and cause anal leakage among other things as you get older?

Girls don't fart. My ex looked like a lily, smelled like jasmine, and tasted like cherries. At no point did she ever smell of ass. According to her, anyway.

I think the more important question is what the hell did you eat to fart so loud?

OP, simply get him the book, "Everybody poops!" Or "What Shat That?"

The real question is,, what’s wrong with your brother. Never met any boy at any age that didn’t think a fart, no matter how loud, the louder the better, was hilarious.