In the seventies blag used as a noun was quite common London speak for a robbery, bank job etc. I think probably popularised by tv shows such as the Sweeney ( Cockney Rhyming Slang for Flying Squad).

Geezer is one of those words with many meanings, or at least nuances, which make English the ideal language for crosswords: it can mean an unremakable person, some geezer on the bus, but by a change in tone of voice can mean someone who is a bit fly, a real man's man like Paul Whitehouse's "Tasty Geezer" in "The Fast show".