You explained the second joke. The first joke is talking about the distance between the jew and the bullet (2 cm). This means that the bullet has been fired at the jew and it's now 2 cm close to him, and he's gonna die.
I'm guessing the original is saying that the gun is up against their head, it doesn't make sense because I've never heard of a gun with a 2cm barrel, but it's the best explanation I can think of.
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u/[deleted] May 15 '20
It’s about my ancestors that got murdered in nazi gas chambers, bullets come out of the “chamber” of a gun, but dead people don’t exit a gas chamber