The produced result of one straddling a toilet bowl in reverse, thus laying faeces across the front side of the porcelain. Often done to spite someone.
Hey, we went round to scrinsin joe's house. that guy is such a chop. I dropped a reverse kanga!
The reverse kanga is the art of laying a poo/shit/dump/turd/crap whilst sitting on a toilet facing backwards towards the flusher. This action causes the poo to run down the front of the bowl leaving a long brown skidmark.
A perfect time to drop a reverse kanga is when visiting a place that you dont like. e.g. school, random building that looks like a church in the city etc.
Doing a poo on someone else toilet backwards to get as much poo everywhere as you can.
Me: Hey that guy Wayne was such a douche.
You: Well go and do a reverse kanga at his place.