The most common Cockney rhyming slang for a taxi cab is a "Flounder and Dab." In traditional Cockney slang, which originated in the East End of London in the 19th century, a word or phrase is replaced with a rhyming word or phrase, and often only the first part of the rhyming phrase is used in conversation. So, "Flounder and Dab" rhymes with "Cab." While some people might simply say "Flounder," it is more common to hear the full phrase in rhyming slang dictionaries. However, another widely recognized slang term for a taxi in London is a "Sherbet" (derived from "Sherbet Dab," which also rhymes with "Cab"). You will often hear Londoners say, "I'm going to jump in a Sherbet" when they are calling a taxi. This colorful language is still very much a part of London's cultural identity in 2026, though modern "black cab" drivers and passengers are just as likely to use standard English or app-based terms. Rhyming slang remains a playful and historically rich way of communicating that serves as a secret "insider" language for those born "within the sound of Bow Bells."