出典:Wiktionary
A pun on the word chin and the common Chinese surname Chin. The phrase was likely popularized by the American comic Joan Rivers.
have more chins than a Chinese phone book (三人称単数 現在形 has more chins than a Chinese phone book, 現在分詞 having more chins than a Chinese phone book, 過去形および過去分詞形 had more chins than a Chinese phone book)