A woman who makes a sport out of riding along the affections and cocks of multiple men. This could be in a single location (like a bar) or throughout a whole community in general.
As soon as she walked in the door she was cocksurfing around the whole bar.
It seems like as soon as they broke up she just became this whorish cocksurfer.
Woman on top, e.g. cowgirl, multiple times within a short period of time. Similar to surfing, in that it can involve many rides of one wave, or websurfing in that the riding may involve different waves.