tripe

Short definition from Wiktionary

Noun

1. 1
   The lining of the large stomach of ruminating animals, when prepared for food.
2. 2
   The entrails; (by extension, humorous or derogatory) the belly.
3. 3
   Something foolish or valueless, especially written works and popular entertainment (movies, television).
4. 4
   An edible lichen, especially rock tripe.

Interjection

1. 1
   That (what has just been said) is untrue.