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1.
The lower abdominal muscles of an out-of-shape or overweight person, or any standard, regular beer drinker. Described as an inverted arch protruding from the gut of a shirtless yokel. Standard issue for most plus size models.
ant.: Abercrombie "V"
Ex. Pokechop is the poster child for the Members Only "U" and damn proud of it.

"Sure, I model! When you weigh two hunskies and a half, Members Only is all over you..... literally"
by Dr. Snoball November 26, 2003