Brazilian airhorn

When your having anal sex with a Brazilian woman (or guy, I don't really care) after he/she finished eating/drinking some thing that would normally cause gas. Then when you pull out she/he will fart very loud (almost sounding like an air horn) and cause your dick to shrivel. Or if your still in the B hole it might sound like some thing is deflating, where you will slowly but surely start to smell it and shrivel up in side her/him.