nounCaribbean, West African
Malicious gossip or rumours; critical or slanderous talk.
adjectiveCaribbean, West African
Given to or characterized by malicious gossip; backbiting; slanderous.
1940s. From French Creole mauvais langue from French mauvais bad + langue; evidently a French Creole calque from West African languages parallel to the Anglophone Creole calque bad-talk.
To disparage, criticize, or abuse (a person, especially someone who is not present).
1950s. From mauvais langue.