If you're not sure whether your steak has gone bad, there are a few signs to look for. First, check the color of the meat. If it's brown or grey, it's probably past its prime. Second, smell the steak. If it smells sour or rotten, it's definitely time to toss it out. Finally, touch the steak and see if it feels slimy or sticky - this is another sign that it's gone bad. If any of these signs are present, your steak has likely gone bad and you should throw it away.