I've been riding for years now, and many times I've been passed by cars where some guy (it's always a guy) sticks his head out the passenger window and goes "WOOOOOOO!" On Saturday some a-clown did it on the highway as the SUV he was in passed me. He had fancy sunglasses on, which the wind caught and ripped off his head. I was tempted to go run them over, but they looked pretty expensive.
But what I want to know is, what does it mean? I'm assuming it's not an invitation for a date, as I'm a hulking bearded Alaskan. Is it an insult? Saying "woooooo" doesn't really insult me, so much as perplex me. What does it mean?