Where did the term you're full of bologna come from?

The term "you're full of bologna" originates from the Italian sausage called "bologna," named after the city of Bologna in Italy. In American slang, "bologna" has come to symbolize something that is nonsensical or not true. The phrase suggests that someone is being insincere or deceptive, akin to saying they're full of nonsense. This expression gained popularity in the mid-20th century as a playful way to call out someone's exaggerations or lies.