The line comes from the character select screen in Super Smash Bros, where the announcer prompts players to pick a fighter before a battle. Because the series has a huge, long-running fan base, the short prompt became a familiar shorthand for choice itself, appearing in gameplay videos, streams and edits whenever someone had to make a pick. It spread through gaming clips and memes rather than as a single viral moment, and it endures because the wording is instantly clear: a decision is coming, and the audience is waiting to see who gets chosen.