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"VOOOM!" is a phrase, added with an air-slicing arm gesture, that one can use to express ones enthsiasm for something, or after a particularly smart, witty, or just plain cool statement has been used.
My car is bigger than yours. VOOOM.

Today, my friend and I both bought scratch cards, she didn't win anything but I did, VOOOM.
by Shannaanbread November 25, 2010