Tac Nayn is the dark, mirrored rival of the famous Nyan Cat, characterized by a grey waffle body, black fur, and glowing red eyes. Emerging shortly after the original Nyan Cat went viral in 2011, Tac Nayn serves as the 'anti-matter' version, typically depicted flying from right to left while accompanied by the Nyan Cat theme music played in reverse. The meme embodies the classic internet trope of creating 'evil' versions of wholesome characters, representing a playful sense of doom and cosmic rivalry. In digital lore, Tac Nayn is often portrayed as the ultimate nemesis, used by creators to express a darker, more chaotic energy than its rainbow-trailing counterpart.