coprolalia
noun
                                                                                                                            
                                                            cop·ro·la·lia
                    
                                                                                                              
                                                                                                                                  ˌkä-prə-ˈlā-lē-ə 
                                                      
                                                          
            
                                
              
          
                                                      : obsessive or uncontrollable use of obscene language                                      
                
                    
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  Merriam-Webster unabridged




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