dedouched = ?

I'm going to make a wild guess and say it's a play on a word. It doesn't mean anything but a douche does and it's frequently used as an insult.
So, it could mean he's being not a douche/jerk/idiot anymore or if he was hanging around a real jerk, it could mean he got rid of him.

Thank you.

With the same meaning as this? -

On the 8th they bivouacked in the gorge at Rodach near Holsteins. Several ... a Cheval, who raced ahead and seized the defile and dedouched on the plateau. ...