from Wiktionary, Creative Commons Attribution/Share-Alike License
- A phrase used to demonstrate differences of pronunciation in various English dialects of the sound represented by the digraph ai.
Coined by Gabriel Pascal for the 1938 screenplay of George Bernard Shaw's Pygmalion. Popularised by Alan Jay Lerner and Frederick Loewe's 1956 musical adaption of the scene, particularly this version from the 1964 musical film "My Fair Lady". (Wiktionary)