bi-vomit Share definition Flag Vomit that goes both ways. When you puke a little in your mouth but swallow it before it escapes. Dude! Your fart smells so bad that it gave me bi-vomit! bi-vomit by mouthfart April 24, 2006 0 0 Get merch Get the bi-vomit mug. Buy Now — $32.95 See more merch