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From Douche and Volcano.

A particularly dangerous form of erupting douche that can go off without warning and expose innocent people for miles around to unsafe levels of douchery.
Oh man that guy on the train was such a fucktard , he managed to piss off everyone in the carriage, what a Douchecano
by The Mechanical Turk March 01, 2011
n. An erupting volcano of douchiness.
We left the frat party because it was about to turn into a douchecano.
by DeSlice January 03, 2012
Boat shoes
Look at that asshole sailing his douche canoes. What a Chad.
by tankgirl626 August 14, 2013