What does choc a bloc mean?

"Choc a bloc" is a colloquial expression that means something is completely full or packed to capacity. The phrase is often used to describe situations, like a crowded room or a full container. It can also be spelled as "chock-a-block." The origin of the term is believed to come from the nautical term referring to blocks of wood used in rigging, indicating that they are tightly packed together.