Where did the term full of bologna come from?

The phrase "full of bologna" is an American idiom that means "full of nonsense" or "untrue". It is thought to have originated in the early 1900s when Italian immigrants in the United States were known for selling bologna sandwiches. Bologna is a type of sausage that is often made with cheap cuts of meat and fillers, so the phrase "full of bologna" came to be associated with something that is low-quality or fake.

Another possible origin of the phrase is from the Italian word "baloney", which means "nonsense". This word was also used by American soldiers during World War I to describe the exaggerated stories that they were told by their superiors.

Over time, the phrase "full of bologna" has become a popular way to describe someone who is lying or exaggerating. It is also used to describe something that is absurd or unbelievable.