Music Yeardley Smith Explains Slang from ‘The Simpsons’ Feb 23, 2019 FacebookTwitterPinterestWhatsAppLinkedinReddItEmailPrint In the latest episode of Vanity Fair’s “Slang School” series, actress Yeardley Smith, the voice behind Lisa Simpson on the long-running animated sitcom, The Simpsons, explains the meanings of some Simpsons’ slang words and phrases.