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English word douchecanoe comes from English douche, English canoe
douche (English)
(slang, derogatory) A contemptible person; a worthless, brainless or disgusting person. (Earlier douche bag.). A jet or current of water or vapour directed upon some part of the body to benefit it medicinally; in particular, such a jet directed at the vagina for vaginal irrigation.. Something that produces the jet or current in the previous sense, such as a syringe. To administer a douche [...]
canoe (English)
To ride or paddle a canoe. (slang) An oversize, usually older, luxury car.. A small long and narrow boat, propelled by one or more people (depending on the size of canoe), using single-bladed paddles. The paddlers face in the direction of travel, in either a seated position, or kneeling on the bottom of the boat. Canoes are open on top, and pointed at both ends.
douchecanoe (English)
(vulgar, slang, pejorative) A rude, obnoxious, or contemptible person.