American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
Gwen Dulugat, 27, also from Paris, said the van -- unauthorized to pick up passengers at the airport -- took off with a "vroom" when Port Authority cops tried to prevent it from leaving.— Vos Iz Neias - (Yiddish:What's News?)
From vroom-vroom to whirr-whirr: a solution to the Melbourne gridlock— On Line Opinion - Latest Articles
"Astroman" off the album bella simone jon: my favourite band's final album, marked by drum and bass flourishes ruby vroom is their best album, but el oso— Adam Riff™
Then of course, after a grippingly picturised zoom-vroom car chase, Sonia and the black hoods decide to combat each other using old-world swords and knives.— Top Stories - Google News
My daughter has recently showed an interest in pushing her toys around as though they were a car and making "vroom" sounds.— Epinions Recent Content for Home

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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