The practice of following ambulances or seeking out people injured at the scene of an accident. The phrase is typically said of lawyers because some pursue medical cases in the hopes of making money by representing the injured party. Can you believe that guy's ambulance chasing? I've been in the ER for 10 minutes and already I've got a lawyer barging in on me! Your ambulance chasing has got to stop, Carl! You're taking advantage of those poor, rattled people, and I can't stand it!