It gets very boring to try hitting on somebody who's completely ignoring you and paying you no attention.

被打的人如果完全无视而且完全不理睬打人者，那对打人者来说就太没劲了。

When you hit on somebody, it means that you're showing somebody that you're interested in them.

当你搭讪某人时，这意味着你向某人表明你对他们感兴趣。