Buttwings are small wings that can be found on the rear-end (butt) of something; they are generally found on non-existent things like Victini and anything that's free to buy.
Victini has a pretty prominent, but small pair of Buttwings that allow it to fly around and cheat the laws of physics.
1) An individual who is hypocritical of others, ignorant of the truth, and just plain 'ole stupid. A term most commonly associated with African-Americans and inbred hicks, but also applies to the entirety of the British population.