Question: As his wife, why does Jessica address Brody by his last name instead of his first name?
Fifteen Million Merits - S1-E2
Question: Is the phrase "pie ape" British slang, or a mix of slang words? Or is just an insult the writers created that isn't based on anything?
Answer: It's a derogatory slang term made up for the show.
Chosen answer: Everyone else calls him Brody or Sgt. Brody, and it probably became habit to her.
The_Iceman
Can't get the source but I read that even the Producer responded to that. Stating that it was common practise for a military wife living in a military complex as everybody refers to their husband by their last name.