Incredibly creepy. You'd be giving off so many "Creepy rapist" vibes it wouldn't be funny.
Depending on your persistance, you'd either get me walking away, or a size 11 combat boot waved in your face prior to me walking away.
Really, what the hell? What would drive you (Your car excluded) to pull over to talk to someone random? They know you don't think they've got a cool personality. They're going about, and they probably have things to do, and you're pulling over because you think they have a nice ass, which, as complimentary as it is, is creepy as hell. Don't be that guy. You'd be a walking, talking stereotype of the creepy guy who doesn't know how to flirt, except in a menacing and completely unsolicited way.
Captcah: "Now look here" indeed.