foo fighter
/ˈfuː ˌfʌɪtə
/noun
An unidentified flying object, originally one of a kind reported by US pilots during the Second World War, usually described as a bright light or ball of fire.The above is a typical example of an encounter with a ‘foo fighter.’...
- Some RCAF buddies talk about the foo fighters they saw over Europe in the last real war.
Origin
1940s: from ‘Where there's foo there's fire’, a nonsense catchphrase from the US Smoky Stover cartoon strip.