추억팔이 (chu-eok pa-ri) – Reminiscence of the past/Throwback
There is no exact translation for this but 추억 means memories, usually referring to sweet memories that one would remember for some time.
팔이 means “seller” but you can’t take it as a direct translation. It’s supposedly a term that is used to talk about nostalgia, referring to any antique or object that reminds people about the past.
I think you can look at it as a “sweet memory seller”, indicating that something or someone “sells” a sweet memory from the olden days to you, making you remember the good ol’ times.
The meaning of the entire phrase was given by a native Korean.