when bill saw the brilliant flash of an atomic explosion on the distant horizon, he knew it was time to put on his apocalypse underwear and hide in the bomb shelter
the oldest, rattiest, and worst-fitting undergarments in your dresser drawer, that one only wears when all others are in the laundry basket
"when bill saw the brilliant flash of an atomic explosion on the distant horizon, he knew it was time to put on his apocalypse underwear and hide in the bomb shelter" What is the definition of "apocalypse underwear"?