Donnie,
It's an abomination spawned by the Counter Strike Source world, involving big, blocky, ugly maps and low gravity + high air acceleration settings to take advantage of the game's "bunnyhop" flaw and allow people to sort of fly around and attempt a series of jumps and other obstacles without falling.
I'm guessing we do not support any surf servers since not only is it
mainly attractive to only 6 year old problem children and the maps are hideous, but the gameplay is individual rather than team-based and has even less to do with the original game than other mods like Jailbreak and such.
Some people think they're fun, I personally think they're a ridiculous waste of server space and am glad we do not promote it.