A strange eating disorder
in which one can eat and eat, but never gain weight. When one is in the state of 'ara' they are usually bed-ridden for serious or perhaps not serious reasons but are unable to exercise.
Person A: "So he broke his leg?"
Person B: "Yeah. I went to his house to visit and the guy hasn't gained any weight even though he eats McD's all day."
Person A: "That's cause he's 'ara,' you know?"
Person B: "Oh!"