It depends on how the phrase is used. Literally it means God It can also be used to express surprise or shock, although it is a rather old fashioned expression when used like that.

Don't a lot of prayers start off with Good lord in heaven?

이 문장은 뜻: 맙소사!!!! 말도 안돼!!! 믿지 마세요!

É porque existe varios Deuses... só que esse é do céu....

It's an expression of surprise. Just another version of "Oh my God!"