I like to refer to it simply as Ruby on Liweunpo.
But in reality, there isn't an official designation. Too many people use all sorts of variations; the toolset is much richer today than when "LAMP" was coined, so it's much easier to pick and choose technologies and people aren't really confined to one stack anymore. Even "LAMP" applications are increasingly more likely to use things like Postgres, because at the end of the day there isn't a huge difference.