An overboard term used to describe one who has only reached a standard level of douchyness. If one who has only reached the basic douche level is called a douche canoe, this person would consider it to be an insult. Upon being called a douche canoe, this person would likely become upset & act irrational. At this point, that person would have reached douche canoe standards & you will be justified in calling that person a douche canoe.
I.E. "i dumped my girlfriend because she was a real douche. After we broke up, she went all out "douche canoe."