1) When on is afflicted by the return of a douchebag thought gone for good.
2) Reduction in the total number of douchebags.
1) The speedfreak who used to hang out by the 7-11 got out of jail and has re-douched the community.
2) The population of Washington, D.C. has been re-douched considerably by the departure of the Bush political appointees.
The liquid that remains after douching that is captured, put back in the douche bag and then re-used (or re-douched).
He is worse than a douche bag--he is re-douche!