A Mullet is a certain type of hair cut that is strongly fashionable among both males and females all around the world. A Mullet is when you have a very shortly trimmed cut on top of your head (no fringe, usually below 3cm long) and a significantly long patch of hair on the back (usually down to the collar bone, but lots of people have shorter) side of your head. usually the sides will also be cut below 1.5cm long to enhance the look but this is not necessary to achieve a Mullet.