The phrase "extreme prejudice" means having a strong and unfair dislike or bias towards someone or something, often leading to unfair treatment or harm. Full definition
So their mission is simple, go back in time and eliminate the alien threat with extreme prejudice. (impulsegamer.com)
With issues of prejudice, it's important to address them politely and openly while always escalating to management and human resources should there be an issue of extreme prejudice or harassment. (blog.simplyhired.com)
To dismiss evidence out of hand for any reason shows extreme prejudice. (religion.blogs.cnn.com)