Rocky comes from Andy Weir's 2021 science fiction novel Project Hail Mary, where the alien engineer becomes friends with human scientist Ryland Grace aboard a desperate mission to save both their worlds. Rocky's speech is translated from musical tones, and his simple repeated phrases became a favourite part of the book for readers. Short clips of good good good spread through fan edits and reaction posts, helped by anticipation for the screen adaptation, and it remains popular because the phrase captures Rocky's optimism in the smallest possible package.