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1.
A pentagon has more sides than a triangle or circle. In this way, a pentadouche is a greater degree of douche than just a normal douche.

It can also be amusing to one-up the pentadouche remark by dropping a larger prefix, like octadouche, or dodecadouche.
Mr. Verwey insisted we were all pentadouches, but I would argue we are douches of a lesser degree.
by MAXDOUCHE May 11, 2010