paper airplane
n.— «Aviation has a long history of what people call “paper airplanes”—some guy comes along who’s going to build a new plane that goes 1,000 miles an hour and only costs $200 to fly, and he raises money and is never heard from again.» —“Founder of firm creating ‘cheap’ jet to speak at DWC” by Dave Brooks Nashua Telegraph (N.H.) Apr. 6, 2005. (source: Double-Tongued Dictionary)
Further reading
While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...
An anadrome is a word that forms a whole new word when you spell it backwards. For example, the word “stressed” spelled backwards is “desserts.” Some people’s first names are anadromes. There’s the girl named Noel...