Why was "tantrum" trending last week?
1919, but it may have origins in 19c. U.S. Southern black speech. Origin unknown, suspects include Latin, Yiddish (e.g. Hebrew kol b'seder), Italian, Louisiana French (coupe-sétique), and Native American. None is considered convincing by linguists.
[1919+ fr black; origin unknown; perhaps fr Louisiana Creole French coupe-se´tique in the same sense, semantically related to cope, attested fr about 1880; perhaps fr Hebrew kol ba seder, ''all in order,'' which may have been acquired by black customers of a Jewish merchant]