The best way to tell if your crab meat has gone bad is by its smell. If it has a sour smell, or basically smells like anything other than crab, don’t eat it. Also, if it has a slimy texture or looks discolored, it is definitely no longer safe to eat.Click to see full answer. Hereof, what does bad crab meat smell like?Pick up the crab and smell it. Raw crab that is fresh will not smell at all, or will have a faintly sweet odor. Anything that smells sour, strong, fishy or rancid could mean the crab has spoiled and it should not be consumed.Beside above, how can you tell if seafood is bad? As long as the flesh is still firm and the skin is shiny rather than slimy, the fish is still fine to cook and eat. If your seafood smells overpoweringly of ammonia, or is mushy, slimy or otherwise questionable, discard it. In this regard, how long does Crab stay good in the fridge? 3 to 5 days What happens if you eat bad crab?In people, consumption of domoic acid causes nausea, diarrhea, and abdominal cramps shortly after eating tainted shellfish. Within 48 hours this can develop into headache, dizziness, confusion, motor weakness, and in severe cases, short-term memory loss, coma, and death.