Yes king has become a popular piece of online slang for exaggerated, supportive praise, often used to cheer someone on with playful confidence rather than literal royalty. As a short audio clip, it spread through reaction videos, edits and streams, where its loud delivery made it easy to drop over a win, a joke or a confident moment. Because the phrase is simple, instantly understood and only a second long, creators keep reusing it as a quick stamp of approval that needs no explanation and fits almost any celebratory clip.