I kinda have to agree abit with the falling apart statement (putting myself at risk here) but I don't think the rock slide has anything to do with that.
We know English people have their own way of humor. We know what he meant, but he used it to describe the rock slides. So he be a wanker...
Secondly, is the driver a female with a bushy mustache, or a man with some serious upper region chest flesh?

Oh no you didn't!
(I was thinking the same thing!)
Well, he could be taking some special hormones.

Yeh that was some serious man boobage..