Jesse Pinkman, played by Aaron Paul, is one of the main characters in Breaking Bad, the American crime drama that ran from 2008 to 2013. His short, laid-back yo became one of his most recognizable verbal habits, often used when greeting Walter White or reacting to a situation. As clips from the show circulated on social media and soundboards, the single word took on a life of its own as a meme greeting. It remains popular because it is instantly recognizable to fans, easy to drop into almost any edit, and carries the show's attitude in just one syllable.