Xander: What's with the hand wave? You see that? Does that, like, mean something?
Willow: It's code. I think it breaks down to "choo-choo!"
Anya: It probably means to follow him. That, or wait here for him.
Willow: Ask him.
Xander: Hey, Riley? What's the [hand wave] all about?
Riley: It means yell real loud so the vampires who don't know we're coming will have a sporting chance.
Xander: See, now he's all mad and sarcastic.