A Passing Fancy is a phrase that describes something that is fleeting or temporary. It can be used to describe a trend, fashion, or idea that is popular for a short period of time. The term is made up of three words: Expresslane (11 letters), FAD (3 letters), and Whim (4 letters). Expresslane refers to something that is done quickly or without much effort. A FAD is a short-lived trend or fashion that is popular for a brief period of time. Lastly, a Whim is an unpredictable or sudden desire or impulse. Together, these three words create the phrase A Passing Fancy, which is used to describe something that is popular for a short period of time.