Search Result for "vroom": 
Wordnet 3.0

NOUN (1)

1. the roaring sound made by a motor that is running at high speed;


VERB (1)

1. make a loud, roaring sound, as of a car engine, while moving; 



WordNet (r) 3.0 (2006):

vroom
    n 1: the roaring sound made by a motor that is running at high
         speed
    v 1: make a loud, roaring sound, as of a car engine, while
         moving