Green’s Dictionary of Slang

(US) dumfounded, utterly confused.

1965

H. Williamson Hustler 70: I don’t know where, until today, I don’t know where I got this money from! [...] I was just dumbafied! [Ibiid.] 99: Then she started takin’ off her clothes. Took off everything but her brassière and panties! I was standin’ there dumbafied.