Even if you're freezing your dip, eventually it will go bad. If you think yours might be on the edge, there are a few clues you can look for. The first is visual. Look for excessive ice crystals on the surface of the dip, which will cause it to be soggy when thawed. You can also give your dip a sniff. You may need to wait until after it has thawed to tell for sure. If it has a sour smell, it's better to be safe than sorry.