The notion of self-centered complacency, i.e., of being satisfied or happy with one's circumstances, and thus unconcerned with anyone else's. Often used as a modifier before a noun, though typically not hyphenated. Primarily heard in UK. What's most interesting is that people who get supplementary income from the government are more likely to have an "I'm all right, Jack" attitude about welfare, tending to oppose broadening the scope to include others who earn less money each week, or none at all.