Hivemind is when two or more people come to the same thought at the same time because of the same circumstances but do not know each other beforehand (i.e. it cannot be an inside joke). This usually happens on internet message boards, and is especially noticeable when the thought reached is not a meme. The name is reflective of insects who act in unison with their hive (or nest) mates.
Poster 1: *Random picture*
Poster 2: Holy shit, that looks just like my mom!
Poster 3: omg, that looks just like my mom
Poster 4: I'd like to meet your mom. Also, hivemind.
a server full of degenerates and edgelords who share one braincell and make music that the average human would literally assume is used to torture people
"Yo bro i found a cool server for producers, its called dothivemind"
"Dont join that shit bruh, your braincells will end up fusing with everyone elses and you might get gender dysphoria"