A name typically given to the male viewers/fans (whether they are straight, gay, bisexual, etc.) of the rebooted version of the My Little Pony: Friendship is Magic show or franchise. They typically do not give in to the hype that males aren’t allowed to enjoy things that may be intended for females.
I used to be a huge My Little Pony fan back in the 80s but bronies follow the 2010 rebooted version of the franchise courtesy of The Hub and Lauren Faust (of The Powerpuff Girls). Now as Ashley has already revealed Spike is a huge brony. I have to admit Cyclops has gotten me to watch a few episodes and while I understand why people enjoy the show personally I always fall asleep while watching it.
SIDE NOTE: They are making a Brony Documentary that follows the story of a BronyCon!! Check out their Kickstarter to learn more. I think I know who’s going to be first in line when this movie is released….