LOL.. I googled that one and it was even funnier than I had imagined!!
http://www.urbandictionary.com/define.php?term=Douche+Canoe
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 Mc Gouches inside. The group of individuals who pour out of the douche canoe can be affectionately referred to as a "shitstorm of douchebags."
Not relegated purely to the hipster variety, I've even seen older, well to-do douche canoes. Sometimes in jodhpurs astride a Ural or other trendy overlandaf conveyance.