* He's trying to impress her with his football knowledge. By demonstrating his understanding of the game, he may hope to make himself look more attractive in her eyes.
* He's testing her football knowledge. He might be wanting to see how much she knows about the sport, as a way of gauging her level of interest in football.
* He's simply trying to make conversation. If the guy is interested in the girl, he may be using the question as a way of starting a conversation and getting to know her better.
* He wants her help. If the guy is genuinely interested in learning how to juke, he may be asking the girl for her help because he believes that she has the knowledge and expertise to help him improve his game.