The top buzzwords in Japan in 2015, as chosen through the annual U-Can Shingo Ryukogo Taisho (U-Can New Words and Buzzwords Awards), were co-winners bakugai and toripuru suri.
The former refers to extreme shopping sprees carried out by Chinese tourists. The latter, Triple 3, to a baseball player finishing a season with at least a .300 average, 30 home runs and 30 stolen bases, which has happened only 11 times. Triple 3 was launched into the national lexicon that year by the Fukuoka SoftBank Hawks' Yuki Yanagita and the Tokyo Yakult Swallows' Tetsuto Yamada, who both achieved the feat.
They're both still filling up boxscores in 2018. But while Yamada is having a good start, we may need a new buzzword for what Yanagita is doing.