As a Noun: 1. The sport of riding towards the seashore on top of a big wave while standing or lying on a long narrow board. English = surfing. 2. A long narrow board that people use in surfing. English = surfboard. 3. A young person who spends a lot of time at the beach, enjoying themselves by going surfing. Informal Australian English = surfie. As a Verb or Adjective: 1. To ride towards the seashore on top of a big wave while standing or lying on a long narrow board. English = surf.