In Commonwealth hackish, "barney" is to fred 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.
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Nearby terms: barfmail « barfulation « barfulous « barney » Baroque » baroque » barrel shifter