Rarely used words and neologisms abound in recent Japanese news…
More than the news-fabricated fly-jin “trend”, my favourite Japanese phrase these days is 疑心暗鬼:
An idiom whose components literally translate to “fear – darkness – demons”, beautifully rendered by the Green Goddess into: “Fear peoples the darkness with monsters”…
In everyday conversation, it can be used as a synonym for “paranoia”.