In his latest book, Brief Interviews with Hideous Men (1999), Wallace describes the Tourettic condition known as coprolalia, or compulsive cursing, except that Wallace's coprolaliac is more bedeviled by slogans than by obscenities.
But there is far better reason to declare of Caliban--"You taught me language; and my profit on't/Is, I know how to curse"--that he was literature's first and greatest coprolaliac, progenitor to Lionel Essrog.