It's a lightweight craft used by douches to move around on the figurative conversational currents to spread their message of doucheness to new individuals who were blissfully unaware of their existence. It also has cupholders, which is the only redeeming quality of the douchecanoe.

One who has a mania for music.

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.

Someone who exceedes the limits of being a normal douche or douche bag.

A person that is so douchey, said douchey-ness travels cross bodies of water.

when a person is so douchey they are equal to about 50 douchebags, therefore a canoe would be needed.

It is much larger than most other forms of douches

1. Any vehicle filled to capacity with a group of major douchebags. Usually a luxury SUV. Most often owned or purchased by the parents of one of the douche mcgouches inside. The group of individuals who pour out of the douche canoe can be affectionately referred to as a "shitstorm of douchebags."