Beaverfungitis Share definition Flag Beaver-fung-itis- an infection a boyfriend or girlfriend will get after they went down on their girlfriends beaver that had a yeast infection does he have chapped lips?? Naw he got beaverfungitis from chowing on nasty beaver Beaverfungitis by Michaelann Dach April 22, 2008 Get the Beaverfungitis mug.