As coined by Joey Greco of Cheaters
fame, a business relationship turned sexual behind the backs of the involved parties significant others.
The scene: Spencer is confronted in a parking garage by his livid wife after having been busted on camera making dirty bathroom love to his secretary.
Secretary: Spencer and I only work together, I swear!!
Joey: I think this is more of a mullet relationship...business in the front, party in the back!!
A long, flat ass, usually (although not exclusively) found on older middle-aged women. It is often accentuated by unstylish, ill-fitting, highwaisted pants or skirts.
Damn, check out the long bum on that bitch!!