'Dilly Dilly' comes from Bud Light's medieval-themed ad campaign, launched by Anheuser-Busch in 2017 with spots set in a fictional kingdom where the catchphrase serves as a royal toast. The spots ran through the NFL season and Super Bowl LII, and the phrase quickly escaped the ads, becoming a stadium chant, a meme caption and a go-to celebration sound like We Are the Champions. Its nonsensical charm kept it alive online long after the campaign ended.