What is a silly sod?

A "silly sod" is a colloquial term primarily used in British English to describe someone who is foolish or behaves in a silly manner. It's often said in a lighthearted or affectionate way, rather than as a serious insult. The phrase combines "silly," meaning lacking in seriousness or sense, with "sod," a slang term for a person, which can carry a mildly derogatory connotation but is frequently used playfully.