Kai Uwe Share definition Flag Kai Uwe is a guy with down-syndrome and a big balloon head. 1. Look at this he has an balloon head. 2. Calm down its an Kai Uwe. Kai Uwe by Adi_Hitler May 11, 2017 0 0 Get merch Get the Kai Uwe mug. Buy Now — $32.95 See more merch