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'Marls Davis' - someone who does sexual acts for things off the McDonald's menu.
This is particularly seen when someone will do something for the pound saver menu.
Girl 1: I could do with a Chicken Mayo
Girl 2: Get one then
Girl 1: I have no money... wait, I bet he would get me one for a Blowie
Girl 2: God you are such a Marls Davis.
by TheBumRing November 01, 2013