It is a sound your car makes when you have wistle tip welded inside your muffler. It is also a saying people use when they have uncontrolable excitement.
The wistles go WOO WOOO!
by KrAzY Indian 187 August 18, 2006
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its on a car, in california, and will spread elsewhere. aka, a whistletip. they r cool and annoying and will b heard from miles away.
it kinda sounds like an alarm clock, dont it?
by The "Fake" Lauren March 28, 2004
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something that really awesome ppl say or have as their aim icon
you we gonna woo wooo!!!
by Lofo (the real one) March 28, 2004
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Is and expression of excitement usually said when you see something nice , beautiful, or horrible. It also can be use to shorten a conversation when the situation being explained is long without going into to much detail.
Wooo woo woo she is fine.

Wooo woo wooo he got hit hard.
Me and Jay was arguing he was talking about my mom and wooo woo wooo so I punched him.
by Everett Williams jr July 9, 2018
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