Like any supplement, pre-workouts will typically have a use by date printed on the tub. Pre-workout supplements tend to go bad if they are made with certain ingredients like fatty acids or fish oil, or ingredients that absorb moisture. If your pre-workout has gone bad, you shouldn't take it anymore because it's unlikely to be effective and can make you sick. If your pre-workout is beyond the date, yes it has expired. Most ingredients will work best within the date but some people will use the supplement anyway.
There are times that you shouldn't use a past date supplement; for example, if you have moldy pre workout. This should be immediately disposed of; there may be some side effects when you consume expired pre-workout like gas or an upset stomach.