The act of standing on a wooden/plastic/foam/softop board anywhere in length between 4' to 15' while a wave (white wash or breaker) pushes you toward the shore. One of the awesomest sports in the world. One can also have "party waves" where many surfers catch a single wave. Or do tricks, or merely catch a barrel (When the breaker curls over and you're caught in a sort of water tunnel).
Katie: What do you like to do?
Mike: Eat, sleep, and surf. Mostly surf.
James: I go surfing everyday.
Katie: What do you do for a living then?