Answer to the question Why Is A Safecracker Called A Peterman:
Safecrackers are nicknamed Petermen or a Peterman for two reasons:
The slang for a safe is a Peter which came from Simon Peter who was known as the rock of Jesus. It may also come from the slang for prison cell which is Peter.
Another religious theory about the origin of the phrase Peterman is that a bank robber or safe blower would be robbing Peter to pay Paul.
The chemical Saltpetre (potassium nitrate) was used as an explosive during safe blowing by villains. A villain who used it was known as a Petre and this soon became
Peterman.
Another theory is that it is London Cockney rhyming slang for safe from the phrase Peter Quaife who was the founding member and the original bass guitarist for the group
The Kinks. It was adopted by bank robbers.