1.
Damned is used by some people to emphasize what they are saying, especially when they are angry or frustrated. (INFORMAL, RUDE)
They're a damned nuisance.
ADJ: ADJ n [emphasis]
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Damned is also an adverb.
We are making a damned good profit, I tell you that.
ADV: ADV adj/adv
2.
If someone says 'I'm damned if I'm going to do it' or 'I'll be damned if I'll do it', they are emphasizing that they do not intend to do something and think it is unreasonable for anyone to expect them to do it. (INFORMAL, RUDE)
PHRASE: V inflects [emphasis]