Currently popular; in fashion; trendy.
今流行りの服はカジュアルで動きやすいデザインが多い。
Trendy clothes now are often casual and easy to move in.
そのカフェは今はやりで、週末は行列ができる。
That café is trendy right now and has lines on weekends.
SNSで紹介された料理が今流行りになることが多い。
Dishes introduced on social media often become trendy.