A Brony is a teenage or grown man who watches a show called My Little Pony. As you can probably guess, the show's intended audience is young girls, and you can probably also guess that Bronies need to find something better to do with their time - like talking with therapists.
They are fangirls or fanboys of the show My Little Pony. I have no clue where they got the word Brony from its so odd unless they took a letter and mixed in with Pony. Its meant for young aged girls of which are too obsessed with the show. its rather odd how they get accepted into society while people who like Pokemon or other anime arent. =/ they need to enjoy other things so they live healthy.