Ource Of All Good Bits: N. A Person From Whom (or A Place From Which) Useful Information May Be Obtained.

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:source of all good bits: n. A person from whom (or a place from
which) useful information may be obtained. If you need to know
about a program, a {guru} might be the source of all good bits.
The title is often applied to a particularly competent secretary.
-- The AI Hackers Dictionary