The way in which douches deduce info and come to decisions. For example they must dedouche whether or not to spike a girls drink, join a fraternity, spike their hair, or wear a extra small shirt as an adult male.
He has the dumb look on his face because he can't dedouche which Nickelback cd to buy.
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To logically conclude someone is a douche.
Mary: Have you met Brad?
Kim: Yep, total tool.
Mary: Agreed. Glad we dedouched that.
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Someone of french origin who is, without any hint of a doubt, a douche.
"Look at that frenchy fag. What a douch."
"Yeah, man, He's Dedouche."
The act of deducing whether or not a guy is a douchebag, fuckboi, etc, or not.
Friend 1: hey you gonna hang out with Brock again?
Friend 2: idk I'm still dedouching