"Post-trib" for short. The doctrine that "the Rapture" - that is, the physical ascension of all Christians into the air during the End Times (itself a doctrine derived from a literal reading of several different passages in the Bible, most particularly 1 Thessalonians 4:17) - will occur after the beginning of the seven-year tribulation, so that Christians will suffer through all or part of the global tyranny of the Antichrist.

See also pre-tribulation rapture.