It's a passive self-protection system for the battle tanks, especially against kinetic energy penetrators and shaped charges. It is used wolrdwide, although the Russian system differs slightly.
The Russian reactive armour consists of Ukrainian washing machines and toilets while they're liberating their neighboring country from Nazis.
Under Armour sports apparel that is inappropriately worn during public, non-sporting events (eg: bars, parties, classroom, restaurants, etc) in an attempt to pass it off as fashionable.
The state of inebriation where one can be part of serious accidents, and emerge unscathed. This is because when inebriated the body does not tense-up in critical situations, and thus avoids injury.
Person 1: "Max wiped out on the stairslast night, it was brutal!"
Person 2: "Did he have to go to the hospital?"
Person 1: "Naw, he was wearing his Drunk Armour"