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Re:Ask HN: Why “hello world” and “foo:bar”? by dragonwriter on Wednesday December 14, 2022 @07:42PM (#33993264)
Re:Ask HN: Why “hello world” and “foo:bar”? by absqueued on Wednesday December 14, 2022 @09:41PM (#33994421)
This is a gem :).

Clearly explains = " ... FUBAR (`Fucked Up Beyond All Repair'), later modified to foobar".