Definition of vroom noun from the Oxford Advanced American Dictionary

 

vroom

 noun
noun
NAmE//vrum//
 
, NAmE//vrʊm//
 
[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.
See the Oxford Advanced Learner's Dictionary entry: vroom