A mullet is a hairstyle in which the front is cut trim, but the back is long, left wild and often uncut. Even when the back is cut, it is still longer than the front. It is the sign of the redneck. Alternate names include:
Ape Drape. Beaver Paddle. Bi – Level. Camaro Cut. Business in the front, Party in the back. Canadian passport. Coupe Longueuil. El-camino. Hockey hair. Kentucky waterfall. Missouri compromise. Mudflap. Neckwarmer. Ranchero. Shlong (short + long). Achy-breaky-bad-mistakey. Soccer rocker. Squirrel pelt. Tennessee tophat. Yep-nope.
source – Urban Dictionary