The term "bomb" has several meanings, depending on its context.
1) In a general sense, it can refer to any explosive device or weapon that is designed to destroy or damage things by exploding.
2) It can also be used figuratively to describe something that is very impressive, exciting, or successful - as in "That party was a bomb!"
3) In the field of finance and economics, it refers to a large amount of money, especially one that has been invested in a risky venture. For example: "If this startup doesn't work out, we could lose our entire bomb."