1. The scene of a final battle between the forces of good and evil, prophesied to occur at the end of the steamworld.

2. A decisive or catastrophic conflict.
Barmageddon Example:

Sunday, May 2nd 2010
by vAnCiTyCaNaDa September 9, 2010
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The final destruction of the British wet pub trade using a health crisis as cover for the neo temperance movement.
The Welsh government saw it's opportunity to invoke barmageddon using a health emergency, whilst presenting no evidence.
by Talsnug December 12, 2020
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