An extremely negative reaction to a wrestler. A heel ought to have heat; if the audience hates him, it’s a sign that he is doing his job properly. Sometimes, however, a wrestler like Eva Marie has “X-Pac heat” (coined after controversial 90’s wrestler X-Pac), which means that the wrestler is hated by the fans for being unskilled, bad at acting, poor at ringwork, or repetitive—not because of their actions in the storyline. A wrestler can also have “backstage heat,” which means that his fellow wrestlers are pissed at him, usually for a perceived lack of respect.

Fan #1: “The rumor is that Roman Reigns has massive heat backstage.”
Fan #2: “I wouldn’t be surprised. He got busted for a drug violation, and that makes the whole locker room look bad.”