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I recently encountered this expression and I'm pretty much stumped. People seem to be using it in place of "who". Example:

[...] they were developed by non-medical professionals whom of which have applied their skills to help solve a health care / medical problem they had faced.

Another example:

As well as Dave, special thanks goes to the 'Girls in Pink' for providing a high service throughout the whole day, as well as club chairman, Bob Thomsett and Chrissie whom of which manned the kitchen which was busy all day.

I can't quite wrap my head around the expression, but I figured it might be one of the many idiosyncrasies of the English language. Is this a valid expression or some newfangled bastardisation?

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They're wrong. "Who" is all you need and what you want. And there's more wrong with those sentences besides "whom of which". – Jim Mar 5 '13 at 20:00
This is fascinating. Google estimates half a million uses (which to be sure probably a tenth or hundredth that number) since the 1980s, mostly in the new century, and it has actually made it into a couple of dozen books. In all of them it simply means who (relative). My best guess is that it's a far-fetched hypercorrection like "gave it to he and I" by people trying to emulate "sophisticated" speech. I'm eager to see any answers about its origin. – StoneyB Mar 5 '13 at 20:14
For what it's worth, a lot of the Google hits seem to be false positives (dictionaries listing "whose, of whom, of which", etc.). If you add -"of whom of which" to the query only 6800 results remain. – blaabjerg Mar 5 '13 at 20:20
The webpage for the 2nd quote (June 2012 entry) also says (Nov 2012 entry) “Seaford ran out 2-1 victors with goals coming from Joel Tucker and Toby Hunter, whom of both have scored plenty already this season” – jwpat7 Mar 5 '13 at 20:27
I think this "construction" is so far removed from "credible" it's simply Too Localised. Searching Google Books for whom of which were/are/was/is/have I did manage to find half-a-dozen instances, but what does that mean? There seem to be at least as many for the equally gibberish whose of which were/are/etc.. – FumbleFingers Mar 5 '13 at 21:16
up vote 4 down vote accepted

No, it is not a valid expression. It's simply bad English

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