Green’s Dictionary of Slang

(US black) used in a variety of phrs. as a euph. for damned adj.

c.1929		Z.N. Hurston Bone of Contention (1995) 970: I’ll be henfired! Simms, you tries to know mo’ ’bout runnin’ de town than me!
1934		Z.N. Hurston Jonah’s Gourd Vine (1995) 166: Well de hen-fired son-of-a-gun done slipped off and never tole me good bye agin!