Caschju Share definition Flag Originated from the abbrieviation for casual. A word to describe something of great magnificence (some thing that is really cool). I got a new bike, it is totally caschju! I'm feeling caschju! Caschju by Kim, Josh and Bex September 8, 2007 0 0 Get merch Get the Caschju mug. Buy Now — $32.95 See more merch