To Hop up on the toilet seat and squat like a Kangaroo when taking a dump. Often done out of fear of catching a VD of the toilet seat. Please note the two definitions provided by James Brick and PaddyM are actually incorrect and are discribing a Reverse Kanga, a witty practical joke that will keep your friends amused for hours)

when you're hungover as shit after a spending a night drunk as a skunk

money, moola, cash, currency. Used amongst tradespeople in Melbourne, Oz.

When someone (usually of chinese extraction) stands / squats on the toilet seat itself when they are taking a shit.

a prison guard

Term used when deficating outdoors in a squatted position into a hole dug for the purpose of burying the evidence.

Similar to a "fupa", but much larger. It orginates from "kangaroo." A kangaroo has that pouch in front to carry the joey.