Actually, "Cor Blimey!" is derrived from the middle-aged expression "God, Blind Me!", used when someone saw something they shouldnt have. Commonly used in expressions by upper-class brits, etc, when in shock, suprised etc. mainly as a form of really stupid exaggeration
Cor Blimey! that young scalliwag yonder stole a fag end willy!
cor blimey arthur, aren't you garring (trans: going) dahn va car lot?
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...'
An expression of surprise or gratitude. See cockney
Cor blimey guvneh! Eis given me a monkey!
If I eva catch that little sod, cor blimey, I'll kill em!