From WordNet (r) 2.0 (August 2003) [wn]:
goddamn
adj 1: used as expletives; "oh, damn (or goddamn)!" [syn: damn]
2: expletives used informally as intensifiers; "he's a blasted
idiot"; "it's a blamed shame"; "a blame cold winter"; "not
a blessed dime"; "I'll be damned (or blessed or darned or
goddamned) if I'll do any such thing"; "he's a damn (or
goddam or goddamned) fool"; "a deuced idiot"; "tired or
his everlasting whimpering"; "an infernal nuisance" [syn:
blasted, blame, blamed, blessed, damn, damned,
darned, deuced, everlasting, goddam, goddamned,
infernal]
adv : extremely; "you are goddamn right!" [syn: goddam,
goddamned]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
goddam \god"dam\ goddamn \god"damn\ goddamned \god"damned\adj.
A more intense and vulgar form of darned; -- often taken as
profane and offensive. [vulgar]
Syn: blasted, blessed, damn, darned, deuced.
[WordNet 1.5]