what is "activist judge"? how does it get use in US supreme court?

如果法官做出了一个让大家都无法接受的判决,这是就可以称他为activist judge. 说穿了就是骂他SB

见WIKI上解释
In practice, a speaker may use the term "activist judge" when a judge has simply made an important decision that the accusing speaker disagrees with. When used in this way, the term "activist judge" is little more than a term of political criticism; it is somewhat akin to, but more sophisticated than, calling the judge an "idiot". While there are many who are willing to use this hot button term as a simple protest of disagreement, this is not the most common usage, nor the most common understanding, of the term. As a general usage, "activist judge" is used to describe a judge who actively and knowingly subverts, misuses, grossly misinterprets, ignores, or otherwise flouts the law and/or legal precedence due to personal opinion, be that opinion ideological, religious, philosophical, or other.