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1.
Turtleists are followers of the Turtleism religion. Turtleists do not believe in any religion besides Turtleism. They worship all turtles and believe that they are holy.
Man: Hey, do you know what religion Guy is?
Lady: Yeah, he's a Turtleist.
by Turtles Are Holy August 16, 2011
 
2.
One who turtles proffessionally, similar to a rapist but around the back
The Manchester turtle-ist strikes again!
by Luke May 22, 2006