[Blarg]

I think gasses can still come up from your stomach. I've sometimes eaten so much garlic or kim chee that after a burp or two I literally MUST brush my teeth again, because all the spit in my entire mouth funks up. Garlic and kim chee stink can come out in your sweat, too, so I'm wouldn't be surprised if it comes out elsewhere. There's always stories of girls saying they can tell what a dude ate by the taste of his spunk. And you can tell what an animal eats by the taste of its flesh. So maybe your spit is just another way that shows it.