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shibboleth

a manner of speaking characteristic of a particular group;
a catchword, pet phrase, or slogan; a platitude or truism;
a custom or belief no longer in vogue

Sightings:

The wrong accent can kill you
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So can weak aspirates
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Straight from the Judges' mouth

The party line

Slogans for the culture wars

Former Psychic Friend tells all

That effing expletive

Debating violent games and Littleton

In the name of freedom

How to be a Superior Person

Bing and Bob and Kerouac
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