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"Dentist" as a fandom term was coined during Yuletide 2012 on Yuletide Coal for sockpuppets who nominate or request extra fandoms a fan didn't have room for in their own nominations or signups. ("I've asked my mom, sister, friend, postman, and dentist to nominate ____ for me.")  The term has now spread to other exchanges.
- See, for example, this thread on Yuletide Coal. (The original dentist is likely buried in another thread on this or the previous post.)