A fad that someone gets caught up in that ultimately makes them look like a douchebag. Some examples are: The faux hawk, popping collars on a polo shirt, getting a tramp stamp, spray on tans or wearing Ed Hardy clothing.
Friend #1: Did you see that Larry grew a 70's pornstache?
Friend #2: Yeah, what a tool.
Hopefully, that mustache growing douchefad will be over before you know it.