Bad Original Kahlua most likely won't make you sick if you drink it, but it will taste horrible! We highly recommend testing it to see if it's still good to consume or not before taking a huge swig. No one wants to drink a lot of sour or bitter liqueur! When talking about the flavored or ready-to-drink variety, it may be risky. This is because the drinks have ingredients more prone to spoilage, such as dairy products. As a result, it's much more dangerous to consume after its expiration date, or it makes you sick.