last trump

Etymology
From the Bible, Paul's first letter to the Corinthians: "We shall all be changed, in a moment, in the twinkling of an eye, at the last trump" (1 Corinthians 15:52, KJV), referring to the last of seven trumpets to be sounded at the Last Judgement. The term used for the instrument in the original Koine Greek is, often translated as “war-trumpet”, but not resembling the modern instrument (see on Wikipedia).

Noun

 * 1)  The moment of God's final judgement on Earth.
 * 2)  A time that will never come; forever.
 * We could wait until the last trump and no-one will turn up.

Translations

 * German: letzte Posaune
 * Persian: صفیر واپسین
 * Portuguese: última trombeta