Jeff Koons is a late 90s-contemporary pop artist, famous or infamous for doing a lot of gaudy kitschy works, like monumental scale metal sculptures of balloon animals painted in metallic paint or kitsch collectable style ceramics (one of his more famous pieces is a gold painted ceramic of michael jackson and bubbles). so the joke is that FF is saying they should deck the halls with mass market dcorations till they look like... a big show of Jeff Koons's work, which borrows the aesthetic of mass market decorations. it's turning what Koons is doing back on its head.

also of note is that Koons is a major touchstone for the Lady Gaga masterpiece Art Pop: "One second I'm the Koons, then suddenly the Koons is me Pop culture was in art, now art's in pop culture in me"

also I am so sorry my jokes are so esoteric and take this long to explain sakjhfaskjhdfsdf