Bli me
"Cor blimey" and "Gor blimey" came from "God blind me" (if I'm lying, etc.). A rough equivalent in American is "May God strike me dead if . . ." British visitors to this site will no doubt have a more complete explanation-I'm on the west side of the pond too. You might also ask your grandparents.
Thanks for the info...Also, kind of hard to ask them since they are no longer among the living.
Sorry-I thought they were because of the way the original question was worded.