foo fighter

English

Etymology

From foo, either a nonce word or a corruption of the French word feu (“fire”), + fighter (“type of aircraft”). (Can this(+) etymology be sourced?)

Noun

foo fighter (plural foo fighters)

  1. Any of various unidentified flying objects, as reported by Allied pilots during World War II.
    • 1965, James Holledge, Flying Saucers Over Australia, Sydney: Horwitz Publications, page 70:
      A former Dutch journalist, Jack Kunst first became interested in UFOs when ‘foo fighters’ were reported in World War II.