Tripe is the stomach of a cow or ox, it is eaten as a dish. Tripe is also used to mean nonsense as well as the food.
Bertie Botts Every Flavoured Beans
Tripe is one of the many flavours in the wizarding product, Bertie Bott's Every Flavour Beans according to Ronald Weasley. He thinks that tripe is a disgusting flavour. 
In 1993, tripe was served at the Great Hall at the Staff Table. Minerva McGonagall both offered Sybill Trelawney tripe as well as using tripe as a comment on Trelawney's previous remark.
- "Before we start, I want your Dementor essays. And I hope for your sake they are better than the tripe I had to endure on resisting the Imperius Curse."
- —Severus Snape insulting the previous homework of the N.E.W.T class.
In the 1996–1997 school year, Professor Snape insulted his Defence Against the Dark Arts class about their essays on resisting the Imperius Curse, calling it tripe.
Behind the scenes
Notes and references