To steal the source code and related files of a Web page and to publish a copy of them on another Web site. It is a form of digital plagiarism. Some programmers will allow you to copy and source their code, but Web designers tend to view their design creations as copyrightable. So, it is not OK to pagejack. You may be tempted to copy a Web page in order to quote a news article on your site, for example (since a link would be unreliable if the original Web site ever removed the article), but you should still to get permission from the original Web site.
NetLingo Classification: Online Jargon