jocker

noun1

1. •
   (slang) A man who perceives himself as straight and is the aggressive top in a relationship between two men, especially in prison.

   • The jocker's sexual behavior can therefore be viewed as situational homosexuality. 2012, "Men Behind Bars: Sexual Exploitation in Prison" By Wayne S. Wooden
   • More common than the reciprocal and mutually constituted homosexual associations between hoboes were the predatory relationships between older hoboes, or “jockers,” and young initiates, or “punks.” 2010, Citizen Hobo: How a Century of Homelessness Shaped America By Todd DePastino