paper airplane
n.— «The much-touted Boeing 7E7 Dreamliner is still just a paper airplane, but that’s likely to change soon.» —“Boeing officials report solid base of commitments to launch 7E7 Dreamliner” by Bob Cox Fort Worth Star-Telegram (Texas) July 21, 2004. (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...
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...