Foobar N. [very Common] Another Widely Used Metasyntactic Variable

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foobar n.

[very common] Another widely used
metasyntactic variable; see foo for etymology. Prob
originally propagated through DECsystem manuals by Digital
Equipment Corporation (DEC) in 1960s and early 1970s;
confirmed sightings there go back to 1972. Hackers do not
generally use this to mean FUBAR in either the slang or jargon
sense. See also Fred Foobar. In RFC1639, "FOOBAR" was made
an abbreviation for "FTP Operation Over Big Address Records", but
this was an obvious backronym.