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1.
The front lawn is cut short and manicured, while the lawn in the backyard is left long and uncut.
Compare your front and backyard lawn cutting to a mullet hairstyle where the hair in the front and back of the head are shorn differently: short in the front, long in the back. A lawn mullet has short grass in the front of the house and long, unkempt grass in the backyard.
by Not-gonna-tellya May 21, 2005