King Flap Share definition Flag The biggest of all flaps, always says there going to come out and always bails. This is the worst kind of human being. "Why does jake keep bailing on nights out?" "Cus jake salmon is king flap" King Flap by jo carrow June 16, 2016 0 0 Get merch Get the King Flap mug. Buy Now — $32.95 See more merch