surfing (Noun) — The sport of riding a surfboard toward the shore on the crest of a wave.
surfing (Verb) — (sport) ride the waves of the sea with a surfboard. ex. "Californians love to surf"
surfing (Verb) — Look around casually and randomly, without seeking anything in particular. ex. "surf the internet or the world wide web"
surfing (Verb) — Switch channels, on television.