unkempt

The subtext here suggests that if a guy as unkempt as Rogen tends to his hair down there, so should every other American bro.

Her dress was tawdry, cheap, and loud, showing signs of wear; her hair was unkempt; her manners were not the manners of a lady.

But she gathered that he was ragged and unkempt, and, from the way he kept looking over his shoulder, evidently apprehensive.

With the back of his hand he pushed up the unkempt hair which obscured his eyes.

There were a number of unkempt men engaged in the same occupation.

Locks of his blond hair, unkempt, dropped over his low forehead into his eyes.