Irina, "trope" is a very useful word referring to an artistic style or category. Use "trope," and the inference is that you're talking about the intellectual approach to the thing, the concept rather than any particular concrete example.
I have to admit that it can be vague, but I use the term to refer to something--a motif, say--that is used repeatedly by different artists. The artist in this case faced a very specific challenge: To take an olfactory category or motif (and I'm being intentionally vague because I of course don't want to put my own definitions on you; it's for you guys to experience and decide for yourselves) that had, post-war, gone completely out of style in North America and which is virtually non-existent in Asia and reinterpret it in 21st century form.
NB: As is frequently the case, it is still admired in France, but, as is frequently the case in France, the French admire its static, antiquated form mostly in theory, not in reality. This is the huge problem France faces, their determination/ desperation to live in a vanished 16th and 17th-century past in which everything French was the best in the world and all things French were automatically superior. A world in which France is a somewhat small country that must compete against Japan, the US, Brazil, etc. in industries and cultural movements where it is 2nd or 3rd-ranked in the real, brutal new globalized economy and the hyper-competitive globalized culture and where the former genuflecting before Frenchness and, say, Truffaut's films is evaporating, attention flooding toward the latest Wong Kar Wai film and Korean flat screen TV, is irritating/ terrifying/ paralyzing to them.
There's a scene in the science fiction movie "Looper" in which Joseph Gordon Levitt's character is studying French and the Jeff Daniels' character, who was sent back from the future, rolls his eyes and says, "Forget France. Go to China." Levitt says, "But I want to go to France." Daniels rolls his eyes. "Kid. I'm from the future. Go to China." Levitt goes to China.
This outmoded motif or category is what I'm calling a "trope," something repeated by numerous artists in their own ways--and now reinvented in S02E01, a few years ago (there's a hint), by this artist.
Also, Irina, I'll tell you one thing concretely: The trope here is not semen, which plays no role in this work.
Johnny, Finnish is both a huge hint and a very tough hint at the same time. I'll explain at the reveal.