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1.
When you want to make a fall on the grenade but the grenade turns out to be bigger than you expected!

Derived from the tsar bomba which was the most powerful nuclear bomb ever detonated.
Dude1: Dude! Last night I had to take one for the team and sacrifice myself by fucking the fat chick. But she was such a fatty that I thought I am not gonna survive this night!

Dude2: It's ok buddy. Somebody had to fall on the grenade.

Dude1: It was not just a grenade! It was a nuclear bomb!

Dude2: So it was a fall on the tsar i guess.

Dude1: Definitely.
by blackman1987 July 03, 2011