means Riding a breaking wave toward shore, typically while standing on a board.

from From "surf," a 17th-century English word for the swell of the sea breaking on a shore — possibly an alteration of "suff," an older term for the rushing of water, its spelling perhaps nudged by "surge." The verb "to surf" arrived with the sport itself, which Europeans first witnessed among Polynesians, especially in Hawaii, where wave-riding (heʻe nalu) was an ancient and honored practice long before any English noun chased after it.