Vetiver smells like...well, it's made from the roots of a really aromatic grass. It's sort of between a dry woody smell and a greener grassy one, if that makes any sense?

Next time you're near anyplace that sells perfume, look for a Guerlain men's scent called oh-so-predictably "Vetiver" -- it's got a bunch of other stuff mixed in but the heart notes are vetiver and cedarwood, so that might give you a little bit of an idea of the pure vetiver note.