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They're referring to the Waffle House Index.

https://en.wikipedia.org/wiki/Waffle_House_Index

To bad the Wikipedia entry is completely wrong on when he coined the term. If it was in response to the July 2011 tornados in Joplin, then how come I have a video of him giving the WFI anecdote in November 2009 at RHOK#0 (Random Hacks of Kindness hack day).

I think it was a play on this: https://en.wikipedia.org/wiki/Waffle_House_Index

it is never bad to be the Waffle House of a thing.

Though actual Waffle House locations will vary...