A Rosiepony is a mythical creature made out of glitter, fruitsnacks, and cream cheese. It is known for it's unique mating call that sounds like something along the lines of, "Your Mom" or "Ni**a" and scalps My Little Ponies for their hair. Typically it is a creature that preys on hot moms, lesbians, and Michael Ceras. Although, Rosieponies do occasionally stalk down Adam Lamberts and Jessica Albas.
"Hide the fruitsnacks, I think there's a Rosiepony in the house!"
"You're gayer than a Rosiepony"