Blue Screen of Death
Guru Meditation started as an error notice displayed by the Commodore Amiga computer when it crashes. It is now also used by Varnish, a software component used by many content-heavy websites. This has led to many internet users seeing a 'Guru Meditation' message (sometimes spelled "Guru Mediation") when these websites suffer crashes or other issues. It is analogous to the "Blue Screen of Death" in Microsoft Windows operating systems, or a kernel panic in Unix.