Understanding the Postgres Hackers Mailing List Language

Reading an established open-source project's developer mailing list
may leave new contributors wishing they had a decoder ring. Greg
Sabino Mullane has written up a valuable explainer
for those new to the PostgreSQL hackers (pgsql-hackers)
mailing list that may also be useful for decoding other lists as well:

The mailing lists are full of acronyms and jargon that might not be
familiar to younger people who did not grow up on email (although text
messages have inherited many of the abbreviations). If you are a
non-native English speaker, or under the age of 30, or not steeped in
the world of tech, I offer some solutions below.

To do this, I downloaded the last year's worth of hackers email,
wrote a program to strip out all the non-human stuff (headers, code
blocks, attachments, etc.), and then did some data analysis on the
results.