Vulgar or highly informal slang for a toilet varies by region but often centers on earthy or derogatory terms. In the United States and Canada, common vulgarisms include "the shitter," "the crapper," or "the john" (though the latter is considered more "slang" than "vulgar"). In the United Kingdom and Australia, you might hear "the bog," "the dunny," or the rhyming slang "the khazi." In more aggressive or crude contexts, people might refer to it as "the porcelain throne" (ironic) or simply "the can." While these terms are frequently used in casual, working-class, or high-stress environments, they are considered inappropriate in professional or polite social settings. The term "crapper" is actually a malapropism derived from Thomas Crapper, an early pioneer of the flushing toilet, though the word itself predates him as a derivative of "crap," making it one of the most enduring vulgarisms in the English language.