Green’s Dictionary of Slang

a vaginal fart.

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: queef US n. Vaginal fart; front botty burp.
2000		hipslang.com 🌐 vart: (n.) a queef or a vaginal fart ex. phewww was that bertha that just busted a vart?
2001		OnLine Dict. of Playground Sl. 🌐 queef n. A ‘fanny fart’, i.e. air expelled from the vagina, normally after sexual interaction of some kind.