Barney: N. In Commonwealth Hackish, `barney' Is To {fred} (sense #1) As {bar} Is To {foo}.

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:barney: n. In Commonwealth hackish, `barney' is to {fred}
(sense #1) as {bar} is to {foo}. That is, people who
commonly use `fred' as their first metasyntactic variable will
often use `barney' second. The reference is, of course, to Fred
Flintstone and Barney Rubble in the Flintstones cartoons.
-- The AI Hackers Dictionary