The vroom is an imitation of an engine rev that has become a staple short sound online because it communicates speed without needing any visual context. Its exact origin is not documented, but the clip circulates on soundboards and in short form video where creators need an instant vehicle cue. The exaggerated rise in pitch makes it work for real cars, toy vehicles, pets, and even people running off screen. That flexibility, plus its very short length, is why it keeps being reused for quick comedic timing.