什么是三版女郎？

我帮你查了词典，Macmillan English-Chinese Dictionary 《麦克米伦英汉双解词典》上是这么解释的：
Page Three girl:a woman who appears TOPLESS(=with her breasts showing) in photographs in some popular UK newspapers.源自英国一些报纸在第三版上刊登裸露上半身的女子照片。