1.InterjectionAn expression of anger, surprise, intense excitement or frustration.
"Person A: You're not going to believe this: he just did it again, despite your warning. Person B: Goddamn!; Person A: You're not going to believe this: he just did it again, despite your warning. Person B: God damn him!"
2.AdjectiveDamned by God.
3.AdjectiveUsed as an intensifier.
"Where's the goddamn cartridge?; You were in the background; you were a goddamn extra! That's good enough!"
4.NounA more emphatic form of damn.
"I don't give a goddamn."
5.NounAlternative form of goddam (“an English person, from French perspective”).