A fake mustache - often ridiculous looking and intended to be funny or ironic. It is most often seen on hipsters and is the primary basis of a mustache party.

It is believed that an individual is given special "douche powers" when wearing a musdouche, which make them intolerable to anyone other than legitimate douchebags and fellow musdouche wearers. Once the musdouche is removed, the individual in question typically returns to their normal state.

When you eat dirt for the first time and leave your family to build a shack in the woods

noun, MUS-doosh, a douchey mustache. Usage is subjective but generally refers to a thin, closely cropped mustache.