The phrase bu ke yi se se became widely shared on Chinese social media as a humorous anti lewd slogan, often posted as text, stickers and short voice replies. Its literal meaning is that lewd content is not permitted, and online communities adopted it as a light hearted way to police themselves. Short audio versions spread through meme pages and chat groups, where the clip is reused as a reaction rather than a serious rule. It remains popular because the wording is instantly understood by Mandarin speakers and easy to drop into any conversation.