Top Definition
The oldest, rattiest, and worst-fitting undergarments in your dresser drawer, that one only wears when all others are in the laundry basket; i.e. in case of the Apocalypse, Rapture, 2012, or the aliens landing.
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.
by rez111 July 20, 2011

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