A meme started on Twitter when @decentlymace tweeted on February 5th, 2020 that while editing a video about the latest Super Smash Bros. Ultimate update to 7.0, he discovered that the Princess Zelda has a frame where you can see the silhouette of her body under her dress with what appears to be a huge ass.
Use this tag wisely, as just because a post might focus on Zelda's ass doesn't mean it refers to this meme. It's best to use this tag for things such as actual "hitbox/hurtbox" models, direct references to the meme (in the commentary or in the image), or depictions of Zelda from either A Link Between Worlds or Smash Bros with a large or otherwise highlighted butt showing through an often partially see-through dress. Also note that posts uploaded before February 5th, 2020 are unlikely to deserve this tag since that's when the first instance of the meme began.