Olivia Rodrigo released deja vu in 2021 as the second single from her debut album Sour, co-written with Dan Nigro. The song describes watching an ex repeat shared experiences with someone new, a theme that quickly resonated with listeners online. Short clips spread through fan edits and social videos, where the title itself became a neat shorthand for repetition and uncanny familiarity. Its polished pop production and instantly recognisable chorus have kept it in rotation for nostalgic edits, relationship comparisons and throwback compilations long after its chart run.