Ero guro nansensu エロ・グロ・ナンセンス
"Erotic grotesque nonsense": a Japanese cultural trend of about 1929–1936 that mixed the erotic, the bizarre and the absurd in fiction, magazines and songs until censorship ended it.
Ero guro nansensu is a Japanese coinage from the English words erotic, grotesque and nonsense. English Wikipedia dates the trend from about 1929, during the Depression, and has it fading after the February 26 Incident of 1936. Its outlets included the magazine Shinseinen, Edogawa Ranpo’s fiction, cheap book series and the magazine Grotesque, banned in 1928. The Home Ministry banned many works, usually for obscenity rather than politics, and publishers answered with self-censorship and underground sales.
The shorter ero guro names the erotic-grotesque mix itself; Wikipedia’s article on it notes that Western readers often wrongly equate it with gore, and that the style returned after the war in manga and music. The cheap postwar kasutori magazines, Wikipedia says, revived it.