The phrase blends Merry Christmas with rizz, the internet slang for charm and flirting skill that became widely used on TikTok and social media in the early 2020s. That wordplay is the whole joke, turning a traditional seasonal greeting into something aimed at younger online audiences. As a result, the sound is most often shared around December, in short festive videos, memes and holiday greetings that lean on slang rather than tradition. Its short length makes it easy to reuse as a quick seasonal punchline year after year.