Flapfest Share definition Flag A party of only girls or where there is a substantial abundance of muff.Antonym: sausage fest. Jessica: Last night was a real flapfest. Samantha: Where was all the dick at? Flapfest by Big Will E September 11, 2010 0 0 Get merch Get the Flapfest mug. Buy Now — $32.95 See more merch