An individual who insists on causing the rest of the earth as much pain as possible; A chap so arrogant and twattish that they have almost no choice but to fuck you over whenever possible.
*Car drives through large puddle, drenching a child*
Child: "Pickles, what a complete Douche Canoe that old chap is!"
Someone who is up shits creek with a turd for a paddle yet takes no responsibility for their situation and find the need to blame everyone else for their predicament.