clopper

plural cloppers

1. One who clops; a horse.

   His slow-paced horse, a clopper and carrier of bells, filled the empty awakening.

   1963, The New Yorker (volume 39, part 3, page 201)

   1 more example

   Mr Binks over there is his front legs, and works his head, the horse's head, I mean. You should see old Clopper when he performs! My, there isn't a horse like him in the world.

   1953, Enid Blyton, Five Go Down to the Sea

2. My Little Pony fandom slangOne who engages in clopping.

   One clopper recently gained quite a bit of notoriety on the Internet by revealing just how far his obsession with the show had gone.

   2013, Katrina Gardner, "Big Boys, Little Ponies", The Express (Las Positas College), Volume 24, Number 19, 5 April 2013, page 4

   2 more examples

   Considering that a significant percentage of bronies are closeted, and taking into account the stigma attached to such practices, it is fair to assume that the real "clopper" population is likely far larger.

   2013 September 9, Thomas Raethel, “The Mysterious World of Bronies”, in Critic, number 22, University of Otago, page 33

   Alexander Carlsson, 25, was jailed in Sanford, Florida, in August on federal child pornography charges, but also told agents that he is a "clopper," which identifies him, he said, as one who masturbates while gazing at figurines and pictures depicting Hasbro's My Little Pony toys.

   2015 September 18, Chuck Shepard, “News Of The Weird”, in Santa Monica Daily Press, volume 14, number 266, page 13