1) One who surfs river waves on a board. In winter too. In Canada in the winter even.
2) Knows all about kayaker girls with std's (see definition: Kayaker)
3) often comes from southern california to get blue balls.
4) finds the standing position most satisfactory, sitting is for taking a shite.
Dude did you see that river surfer catch that wave? He got std's from those kayaker girls. It's -20C out, his balls must be shrunk by now.