Someone who is attending Bonnaroo. It originates from people who go around the first night constantly screaming, "Bon-aruuuu-uuuuu!" Other adjectives can be used in front of the word to describe what kind of a luder they are. For example, there are hippy-luders, baby-luders, drunk-luders, phish-luders, stoned-luders, ect.
Alex: "Look at that group of girls with peace sign necklaces and headbands by the main stage."
James: "What a bunch of hippy-luders."