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It's a fancy gamer term for crowd (herd) mentality when playing games.
Originally Posted by WIKI
The term herd mentality is the word herd, meaning "group of animals," and mentality, implying a certain frame of mind. However the most succinct definition would be: "how large numbers of people act in the same ways at the same times."
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I.e. Zerg groups will all change to HA or MAXes if they see other players doing it.