"Surfing" is a strange little quirk that's long been available in the Counter-Strike series. Those wondering if it'll make the jump to the latest version, Counter-Strike: GO, yes, it has made the jump.
Player MitchellS has ported venerable CS map surf_greatriver_remix to Global Offensive, and has made it playable for those in the beta. You can see it in action in the video above.
"Surfing" dramatically changes the way you play the game. Join a surfing server and the corridor shooter you're used to playing disappears, replaced with something much faster and chaotic.
Port of the classic "surf_greatriver_remix" to Global Offensive [Game Banana, thanks Moskeeto!]