sliding over mud is wayyyyy slow and thick. there is no chance of turning or being in any sort of control other than heading straight down hill. he must be messing with you unless maybe hes talking about snow thats really dirty so its kind of like mud?
I've sand skied in a big sand pit. it was real steep so it was kinda fun, almost like super heavy powder. falling sucks tho. it was a long time ago on old straight skis, someone should rip some sand on like Jah Loves
Too bad, that could actually be a pretty sick edit if you could get some rails in there. I think it would sweet to see a mud rail jam, kind a deal. I'd do it. That's why you don't throw out your old gear.