I like a guy I barely know?

Ok, so there's this guy. Lets call him W. I've only talked to W a few times, and they were like minute long conversations (On Facebook). But everything about him makes me want to jump and go crazy and he is really nice. But, he knows I like him. He's one of those guys that all the girls love and he knows it. Also, he is a MAJOR (and i really do mean major) flirt. Like literally ever girl he thinks is cute. Also, he's a grade ahead of me. But I REALLY want to talk to him, I just don't know how I could without him thinking I'm a weirdo (haha.) and pleaseee do not tell me to just go up to him and say "hi" or "what's up". something more creative. thank you sooooo much in advance