1An elephant living apart from the herd and having savage or destructive tendencies.
2A person or agency whose activities are antisocial and destructive.
Mid 19th century. From rogue + elephant. Compare Sinhala hora aliyā from hora thievish, restive (from horā thief from Sanskrit cora) + aliyā elephant (not the usual word for the animal; from Tamil alliyaṉ stray elephant), although it is uncertain whether the English expression is after Sinhala or vice versa.