The Brown Meat

 is a canned food Stan Pines was stocking up in preparation of the apocalypse.

History
Stan was stocking up the meat in the Mystery Shack in preparation for a supposed apocalypse. After listening to Dipper's theory on Robbie using music to hypnotize Wendy, and then telling Dipper his own past heartbreak, he eats more of the Brown Meat. He describes it as "apocalicious."