It's pretty manageable, like 15k queries per hour on and off since yesterday. It's been easy to flag and block. Not really sure what they are trying to do, the queries just look like a bunch of random keywords, almost like they are looking for blogspam. But it's too overspecified so they're not getting any meaningful results.

I have a hunch they are trying to estimate the ranking of like hacked WordPress installs, because their search terms look a lot like the sort of keyword stuffing you find on those.