If you say that someone has only themselves to blame or has no-one but themselves to blame, you mean that they are responsible for something bad that has happened to them and that you have no sympathy for them.
"he's a blasted idiot""it's a blamed shame""a blame cold winter""not a blessed dime""I'll be damned (or blessed or darned or goddamned) if I'll do any such thing""he's a damn (or goddam or goddamned) fool""a deuced idiot""tired or his everlasting whimpering""an infernal nuisance"