Music Yeardley Smith Explains Slang from ‘The Simpsons’ Feb 23, 2019 Facebook Twitter Pinterest WhatsApp Linkedin ReddIt Email Print 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.