Mustachioed: a fantastic adjective, one which could live up to the expectations of increased usage. Derived not from mustache but from the noun mustachio, meaning a long and elaborate mustache.
I think you'd agree that neither mustachio nor mustached, an adjective derived from mustache, are anywhere near as fly as mustachioed. The word just twirls around the tongue like a dancer around her pole, and it suggests not just a striking instance of facial hair but the cool and calculating gunslinger wearing it.
Example: A mustachioed Adam Morrison calmly sank two free throws to help Gonzaga stave off a determined Xavier team in the first round of the NCAA Tournament.