'ring flu

Describes the obsession a racer may contract after driving on the Nürburgring in Germany. 'Ring flu is characterized by the irresistible desire to drive on the track, even if one is hundreds of miles away from it.

Friend #1: "Do you think Jon is ever going to quit? He's already done ten laps today!"
Friend #2: "No, I think he's got 'ring flu."
Friend #1: "Yeah, I thought so."