The phrase "atom bomb" refers to a very powerful and destructive type of weapon that uses the energy released by splitting atoms to cause a big explosion. Full definition
We are not perfect, and sometimes we make horrible mistakes like relying on fossil fuels for energy, or building atom bombs. (dotearth.blogs.nytimes.com)
They flop themselves on the floor and explode into an emotional atom bomb. (adventuresandpreggers.com)
If atom bomb blast then it doesn't matter how fast you can run or how well - protected is our house, you can't save yourself. (paulasset.com)