The "Happy Cat" meme features a chubby gray British Shorthair with striking orange eyes and a distinctive, wide-open grin that seems to scream pure joy. This particular image of the cat has become iconic in the meme world as it perfectly encapsulates an expression of unrestrained happiness and excitement. The meme likely gained popularity due to the cat's unique and exaggerated expression, making it an ideal template for conveying moments of unexpected delight or simple joy. The character of the cat, often anthropomorphized, adds to the charm and relatability of the meme.