The Girl Genius wiki, in a footnote to its article on the Other, makes an extremely cryptic reference:
WOG on a thread incarnation of the other.
This suggests that Kaja or Phil Foglio at some point said something about an form of the Other with some link to thread. Nonetheless, this is quite vague.
Unfortunately, the included link is defunct, and does not appeared to have been archived. A web search turns up nothing.
What is meant by "a thread incarnation of the Other"? The word "thread" is mentioned both in the footnote and its referent, so it is not likely to be a misspelling.