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It's orginal function was a filtering device, the unknown (to the user) nuances of which would belie the user as a spy.

So, it's kinda fun that the Left goes apoplectic when we spot their code words and call them on it. Politically correct terms, refusing to call a terrorist a terrorist, always using the phrase, "right wing" to describe a Republican, and never using "left wing" to describe a Democrat, are all shibboleths that helpfully identify the smiling speaker no matter what else they may profess.

We've even evolved to shibboleth sarcasm with phrases like, "pajamajadin" or "not that there's anything wrong with that" or, "I have the utmost respect for our troops, but..."

Now, off to work!

Happy B'day, G.