Definition of vroom noun from the Oxford Advanced Learner's Dictionary

 

vroom

 noun
noun
BrE BrE//vruːm//
 
; NAmE NAmE//vruːm//
 
[uncountable]
 
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used to represent the loud sound made by a vehicle moving very fast Vroom! A sports car roared past. Put some extra vroom in your life. More Like This Onomatopoeic words beep, bleep, boohoo, brrr, buzz, click, clip-clop, ding-dong, hiss, mwah, peep, ping, plop, pop, rat-tat, splat, splosh, squeak, squeal, squelch, swish, tee-hee, thud, thwack, tick-tock, toot, vroom, wham, whoosh, zoomSee worksheet. Word Origin 1960s: imitative.
See the Oxford Advanced American Dictionary entry: vroom