Medieval monks and Jim Carrey in Dumb and Dumber share a penchant (a tendency, partiality, or preference) for the hard-to-pull-off bowl haircut. It's a style with do-it-yourself connotations and a low-maintenance,low-cost look. For a character like Lloyd Christmas, it plays up his naivety and ineptitude. But for women in genre, and this mushroom ‘do has a number of ascribed meanings that are less approximately humor and more associated with power. It is the style of smart,hyper-competent, and sometimes aloof women — women who are often there to support or lead the protagonist toward whatever task they hold been sent to total.
Source: blastr.com