A person who rides a surfboard. / A person who surfs the Internet. / (obsolete) A duck, the surf scoter (Melanitta perspicillata).

plural of surfer

(surfing, slang) A hard bump or nodule on a surfer's knee, shin or ankle, resulting from recurrent contact with the surfboard.

(surfing, slang) Synonym of surfer's knob

(informal) An elderly person who regularly uses the Internet.

Someone who engages in shoulder surfing.

plural of shoulder surfer

A person who illegally rides on the top of an elevator car, outside the actual confines of the car.

plural of elevator surfer

Someone carried by a crowd, in crowd surfing.