The story
From dark + -zilla. From being the dark sector version of WIMPzilla. Coined by Katherine Freese and Martin Wolfgang Winkler in 2023.
Etymology from Wiktionary, CC BY-SA 4.0.
dark-zilla
Today it means: Theoretical extremely massive dark matter particle, orders of magnitude greater than 10¹⁰ GeV (gigaelectronvolts), thought to be generated by a vacuum phase change event, where rapidly colliding collapsing bubbles of false vacuum generate the particles in energetic collisions. Full definition →