kaci Share definition Flag sexy chipmunk who is a cronic surfer, who is also known as a hippopotomussiissess : ) she is black and she laughs really loud. everyone loves kaciii omg you are such a kaci whos a kaci tahaaa nott you! kaci by suavehh January 2, 2008 0 0 Get merch Get the kaci mug. Buy Now — $32.95 See more merch