This is The Jargon File (Eric Raymond): a long-running compendium of hacker slang, folklore, humor, and customs - part dictionary, part cultural archive. If you want to understand the tone and mental furniture of old-school computing culture, this is one of the canonical texts.
This page currently points to version 4.3.3; other snapshots exist, so when quoting, please cite the version/date.
On one hand: I host a local PDF snapshot here for boring reasons, i.e. stable access, working internal links, and offline-friendly. On the other hand...
License and citation
The Jargon File is explicitly placed in the public domain: free to use, share, and modify. The only thing asked for is courtesy: cite properly when quoting, ideally including a version number and date.