A Docperian is a person whose favorite soda is Dr. Pepper, and considers drinking anything else borderline sacrilegious. The term was coined in the popular visual novel Steins;Gate by a character named Okabe Rintaro.
When Phil offered to get Dave a Pepsi, Dave almost exploded. "I thought you knew I was a dedicated Docperian! Get me a Dr. Pepper if you're going to get me anything at all!"
by Marsstriker February 18, 2016