Definitions
Wiktionary
- Really? Is it true?
Examples
“The point to be noted here is that so far as concerned the atrocious miseries of the working-people, it was not necessary even to pretend to do anything.”
The Profits of Religion: An Essay in Economic Interpretation
“Now who is that so base and ungrateful as to rise from a table where such delicious victuals are served and "backbite" the neighbor who prepares it?”
Lists
These user-created lists contain the word ‘is that so’.
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Scripted Apathy
How to sound like you're paying attention when you're really more interested in your plans for the weekend. Bonus points for actually printing this script out and reading it in front of the windbag...
mmhmm, yeah, ok, sure, of course, oh yeah, yep, 'kay, hmm, interesting, perhaps, absolutely and 37 more...
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Mogeltron
Miscellaneous idiolect that could be used to assemble a Whichbe simulator.
point of skew, character as fate, doubt for doubt, story of my life, cumulative effect, default settings, reasonable, or tr..., take care, relative proportion, is that so, cognitive bias, and whatnot and 41 more...
Tweets
Looking for tweets for is that so.

reesetee You don't say? Nov 25, 2008
bilby Is that so? Nov 23, 2008
whichbe A three year old just told me that I say this a lot. Nov 23, 2008