expression, noun which may take the genitive case particle 'no'
much-talked-about; trending; in vogue
Describes something that is currently a hot topic among the general public or in the media. Often used as a prenominal modifier (〜の).
I went to the restaurant that everyone's been talking about.
That movie is the talk of the town.
流行 means 'trend' or 'fashion', focusing on widespread adoption. 巷で話題 emphasizes being talked about, not necessarily adopted.
Standard kanji spelling; 巷 is a common kanji for 'the streets' or 'public discourse'.
Kana spelling for 巷; used when the kanji is considered difficult or for emphasis.
Compound of 巷 (ちまた, 'the streets; public') + で (locative particle) + 話題 (わだい, 'topic'). Literally 'a topic in the streets', meaning something widely discussed among people.