The 'Rainbow Kiss' meme centers around a shock-value term popularized on sites like Urban Dictionary and TikTok. It typically follows the format of a person reacting to the discovery of the term's graphic definition, which involves a specific exchange of bodily fluids during intimacy. While the term has existed for decades, it gained meme status as a 'don't search this' challenge, fitting perfectly into the genre of internet gross-out humor. Users often use the template to depict the loss of innocence or the regret associated with satisfying one's curiosity on the darker corners of the web.