JoPlap Share definition Flag Sound effect usually made when a unaware moving object crashes into a barricade of some sort. Usually deals with extreme amount of damage or pain. Adj. means you're a Jerk Face Asshole. Yo, that teacher was definitly a JoPlap. JoPlap by USuCK2526 January 14, 2009 0 0 Get merch Get the JoPlap mug. Buy Now — $32.95 See more merch