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When you start off watching "Ninjas" and keep watching the videos that are shown at the end of the video until you end up on "Backyard wrestling".
Greg: Man, I watched some pretty messed up backyard wrestling on youtube. Is that stuff even real?

Susan: Why were you watching backyard wrestling?

Greg: I was YouTube surfing!
by PixelzlexiP June 21, 2009
The act of clicking on random videos on youtube, and in the end landing on a really random vid.
(Guy 1) Dude, I found a video of a cat eating a dude's shit.

(Guy 2) What? Why did you look that up?

(Guy 1) I didn't, I was just You-Tube Surfing and it came up!
by Macca97 February 20, 2011