A bronie is a male fan, usually overly-obsessive, with the remake of My Little Pony: Friendship is Magic. This guy, however, is reason enough to look for a new favorite TV show.
As a fellow nerd, I use the term nerd as one I use with my own people. Even at my level of nerd-dom, it's a little embarrassing to watch other nerds in their natural habitat like conventions like the one in this video. This guy (he's a guy?) yells out, "Bronies Assemble!" Let's see what happens.
Honestly, I don't know what to say about this. The lack of facial expressions is kinda disturbing, and, you know, THIS IS A GROWN F***ING MAN! Weird...