Interjection: "May
God blind me!" was once a serious oath, not sworn in
anything but earnest. It's shortening was partly to avoid offence and partly for brevity. See also gawd blimey.
Part of a song by
Lonnie Donegan:
'Oh, my old man's a dustman,
He wears a dustman's hat,
He wears cor-
blimey trousers
And he lives in a council
flat...'