It's the term which is used by black hat SEO who utilize the content of any content rich website and by using their content and giving the link of original website. It can be a huge negative point to the original website as the took content can be used with same meta tag and title which can boost the search engine ranking of the duplicate site the stole website can help to earn more money then original website generally it comes in copywriter law but black hat SEO utilization it which can cause to penalize the original website, so you should take care of your website content and if it is stolen then you should do needful to avoid it.