nuclear bunker 

a place where you are safe from nuclear bombs

we should head to the nuclear bunker before we die

nuclear bunker by kilxu February 13, 2022

nuclear bunker ass 

Exaggerating the fact that a person is so fat that his/her ass can be used as a bunker during times of a nuclear apocalypse.

"Shit mate! I heard WWIII is gonna start soon!"
"Naah, we'll be just fine mate! No need to fear when Danny's nuclear bunker ass is here!"

nuclear bunker ass by F-Bomb Thiru May 4, 2017