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Mai Kuha quotes the following sentence as a funny use of "where." "I've also included a trigger, where a trigger is gonna be a little marker [...]." Using "where" this way is standard mathematics (and perhaps computer science?) jargon, e.g. "f is a continuous map from A to B, where B is any topological space and A is a manifold." "A manifold is a Hausdorff space which is locally homeomorphic to R^n, where a Hausdorff space is ...." or where, by Hausdorff space, I mean a space ..." "A deforms into B, where by "deforms" I mean ...." In this construction, "where" is used to introduce definitions of (essentially any set of) terms in the preceding clause. I think the "place" antecedent of "where" is the preceding clause itself, considered as a string of words, not anything in its semantic content. However, I think this is, at best, a historical explanation. I don't know if this is where your informant got the construction, however. Margaret Fleck (mfleckMail to author|Respond to list|Read more issues|LINGUIST home page|Top of issuecs.uiowa.edu)
I am sorry to be late responding to the which' query, but since my contribution was bibliographical I was sure someone else would note it. Apparently not. There is a large collection of these forms in Jennifer Greene, Which,' in Shuy & Shnukal (eds) Language Use & the Uses of Language Georgetown Uni. Press, 1980, pp. 143-161, and a good bibliography. Dennis PrestonMail to author|Respond to list|Read more issues|LINGUIST home page|Top of issue