Originally coined by my late father who was angry about somebody on TV, it's a very versatile expression that conveys the absolute worst of a situation, person, place, or thing. Best used as a wisecrack or in total exasperation, disbelief, or disgust.
Ex 1) "Ugh, man ... she's uglier than a mudfence in the rain!"

Ex 2) "That makes about as much sense as a mud fence in the rain."

Ex 3) "Jesus, this country is falling apart like a mud fence in the rain!"
by Sizemore December 2, 2005
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