What is page jacking?
 

A way of spamming the index of a search engine. It is achieved by creating a rogue copy of a popular web site, which shows contents similar to the original, to a web crawler, but redirects web surfers to unrelated or malicious web sites.

it will harm your website Serps..

Pagejacking is stealing the contents of a Web site by copying some of its pages.

Thank you guys i was not aware about it before.This is something new.I never do Pagejacking .

Can you please make it more clarify? it is interesting but i can't understand the technicalities so please explain in more.

Nice information it is really new and interesting information to all
keep sharing

The term Page jacking is a combination of the words Web page and hijacking, indicating that a Web page has been hijacked.
In other words "The activity of stealing content from a Web site and copying it into another Web site in order to siphon some of the original site?"