"Tsar Bomba; slang term, derived from Russian; "Supreme Bomb" In the 1950s the Soviet Union (Communist Russia) detonated the largest thermonuclear fusion explosion of that or any time, 50 megatons = 50 million tons of TNT (250 x Hiroshima/Nagasaki)
A maximum superlative, refers to a major feat, revelation or devastating point or refutation. That which cannot be equaled nor exceeded.
Basketball players chest bump, up by 30 points, after slam dunk, shout 'TSAR BOMBA!" or,
One friend says to another responding to a profound statement, "Tsar Bomba. Seriously"!
A beach beauty like Jessica Simpson walks by admiring males, who all stare and whisper, "Tsar Bomba".
The Russian version of the Jägerbomb. An energy drink (monster, etc) is emptied into a tumbler, a shot of Vodka is then dropped into the tumbler (from as high as possible to mirror the 50 Megaton beast dropped by the Ruskies). The heart attack inducing elixir is then downed. Enjoy.