peeper flaps Share definition Flag slang for Labia Also See: Meat Curtians, Beef Curtains, Meat Flaps... "i know someone who called her labia 'peeper flaps'. the reasoning was that boys had 'peepers' so girls had 'peeper flaps'." peeper flaps by SGStirfry June 20, 2006 0 0 Get merch Get the peeper flaps mug. Buy Now — $32.95 See more merch