Essentially, "It's okay." Comment ça va? means, "How are you?" It can mean, "enough!" when used like this: Oh ! Ça va ! and ça va bien? means, "It goes okay?" or "Is it going well?" -- and then repeated by the other person it means, "It goes well" or "I'm doing well." But ça ne va pas or just ça va pas means, "not so much." (it's not going well, or, it's not okay).