A conglomeration of the words "dirty" and "hippy"; a dirty hippy. A bearded boy who is more than likely an English or philosophy major and owns at least 12 pairs of Chuck Taylors. These elusive creatures can be sighted at coffee shops and Whole Foods Markets; they are more than likely vegetarians or vegans. He smokes weed daily, but only showers once a week.
Zac, the dirpy, has the most impressive beard I've ever seen!