An Armoured Personnel Carrier. Usually a vehicle used by the military to create a safe environment for soldiers when they are traveling.
A variation of the Armoured Personnel Carrier is a pregnant woman wearing a bullet-proofed vest or medieval armour.
APCs are used to transport soldiers from one point to another safely in battle, as the typical APC is a combination of a lightweight tank and a 6-seater car (excludes drivers).
Bob saw a pregnant woman walking down the street wearing a bulletproof vest. "Well if a pregnant woman carries a child, she's a personnel carrier. And if she's wearing a bulletproof vest, she's armoured. Hey! She's an armoured personnel carrier - APC!" he murmured to himself.