foulmouth

   A reference to a person who habitually uses obscenities. The word has been in use since at least the seventeenth century. Shakespeare does not use the word as a vocative, but he refers on three occasions to people who are foul-mouthed. In Henry the Fourth Part One (3:iii), for instance, Hostess Quickly tells Prince Hal that Falstaff ‘speaks most vilely of you, like a foul-mouth’d man as he is, and said he would cudgel you’. In The Country Girls, by Edna O’Brien, ‘you stinking little foulmouth’ is used insultingly.