If you're not sure whether your stew meat has gone bad, there are a few things you can look for. First, check the color of the meat. If it's brown or gray, it's probably past its prime. Second, smell the meat. If it smells sour or rancid, it's time to toss it. Finally, touch the meat. If it feels slimy or tacky, it's a sign that it's gone bad. If you're still not sure, err on the side of caution and throw it out. Better safe than sorry!