the.com/tripe

means The edible lining of an animal's stomach (usually a cow's), and by extension anything considered worthless nonsense or rubbish.

from From Old French 'tripe,' meaning entrails or stomach, which came from a general medieval European word for the guts of an animal used as food — its deeper roots are murky, possibly tracing to a Vulgar Latin or older continental root, but no one can say for certain. The jump to meaning 'nonsense' or 'rubbish' happened later in English, once tripe-as-food had already earned a reputation as cheap, unglamorous fare — the kind of thing a snob might sneer at, which made it a ready insult for talk or writing judged equally low-grade.