Questions about example sentences with, and the definition and usage of "Goddam"

A: Goddamn is a curse word. Specifically, it is blasphemy. But here it really doesn't mean anything; it is just added for emphasis. It makes the action of the sentence very strong.
You can use any curse word here and it has the same meaning (to add emphasis).
"Then they'll just take that fucking plane apart."
"Then they'll just take that damn plane apart."

A: "Goddamn" is a slang adjective that emphasizes the following word, in this case "thug". "Thug" is a word to describe a delinquent, similar to "ヤンキー".

A: Goddamn is often used to express frustration, as in: This test is so goddamn hard to study for.

It's important to note that "goddamn" can be very offensive to some people because they consider it insulting to their God, so it's best to use this word around friends or people you know won't be offended by it.

A: Like saying くそ or 畜生 when something negative happens to you.