Popular Phrase, Catchphrase, Popular Word, Buzzword
noun
You know that 流行 means "trend", so "trend" language means a popular phrase. Yolo! It could also be a catchphrase, a popular word, or a buzzword.
りゅうこうご
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
最近の流行語は全然分かりません。
I don't know any of the recent buzzwords.
毎年ほんとに色んな流行語が生まれるよね。
A lot of new catchphrases are born every year, huh?
どの流行語が、今年の流行語大賞に選ばれると思う？
Which popular phrase do you think will be chosen for this year's buzzword of the year?