This sound refers to Mechagodzilla as heard in the 2021 film Godzilla vs. Kong, where the robotic kaiju appears as a major threat. Short clips of the roar spread through fan edits, versus videos and monster compilations because the sound is instantly recognizable and carries a heavy sci-fi edge. It stays popular in kaiju content because it separates Mechagodzilla from organic monster roars, giving creators a cleaner way to signal technology, power and cinematic destruction in a very short audio cue.