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1.
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
 
2.
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 27, 2004
 
3.
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