"Damn" is a mildly profane word used in North America, the United Kingdom and Australia. The use of "damn" in Rhett Butler's parting line to Scarlett O'Hara in the film Gone with the Wind in 1939 captivated moviegoers with "Frankly, my dear, I don't give a damn."
"Damn" is also used in some areas of the world [where?] as an exclamation when an extremely attractive person or object of approval is located; e.g. "Damn, he/she is fine" or perhaps "Damn, he has a nice car!". "Hot damn" may be used similarly, but it is somewhat distinct; for example, if one says, "Joe just won the lottery," a response of "Damn!" on its own can indicate disapproval, but "Hot damn!" indicates approval or surprise or pain.
"Damned" is also used as an adjective synonymous with "annoying" or "uncooperative," or as a means of giving emphasis. For example, "The damn(ed) furnace isn't working again!" or, "I just washed the damn(ed) car!" or, "The damn(ed) dog won't stop barking!" (The word "damned" is usually only used in North America, whereas in other English speaking countries the word is simply "damn".)
"Dang" or "darn" are sometimes used as euphemisms, specifically minced oaths, for damn.
that's all I can say...