Filletbia Share definition Flag Large meaty or beefy labia majora. So large that they resemble cuts of fillet mignon. Dude I was surfing some porn and I saw this chick with awesome filletbia. Filletbia by BigBlackBlick January 19, 2010 0 0 Get merch Get the Filletbia mug. Buy Now — $32.95 See more merch