Not a definition but the orgin of the phrase: This phrase was coined in 2004 by Blake Edmondson in Camp Walker, South Korea. It was used as an alternative phrase for someone being a complete moron / dick / dirtbag. After Edmondson transferred stations I attempted to pass this phrase on along with other greats such as..... Gungle a gungle, (rumble of a V8) Kadouche (boom), and Splack (disgusting splash).
Mongo don't be such a douche canoe, just drink the damn shot!
