The name of the shipping couple between Twilight Sparkle and Rainbow Dash from My Little Pony:FIM. It is the favorite of most people and is one of the most common and cutest. usually paired with RariJack in FanFics.
The Flying High, Falling Hard FanFic, the Cloud Nine FanFic, and the Building Bridges FanFic. These are all TwiDash FanFics.