Flaplacious Share definition Flag 1. cool 2. lame 3. a word used to confuse the mind as to its true meaning "Dude, that shirt is flaplacious" "Thanks!" *2 seconds later...confusion ensues...* Flaplacious by EagleEye53 June 9, 2009 0 0 Get merch Get the Flaplacious mug. Buy Now — $32.95 See more merch