Green’s Dictionary of Slang

gorblimey! excl.

also cor blimey! cor blimy! gaw bli me! gawblimey! gawblimy! gawd blimey! God blimey! gorblarney! gor bli! gorblime! gorblimey O’Reilly! gorblimy! gor glomey! lorblime!

[late 19C+] a mild, euphemistic oath, lit. ‘God blind me!’.