I was like

This is not easy to explain.

Sometimes when people are telling each other about something that happened, they use this expression to say what they said or how they felt. You have to experience this to really understand how it works. Here is an example:

***

You: What did you do last night?

Your friend: Well, my brother called and he was like, do you want to hang out, and I was like, I'm kind of tired and he was like, I can come over and we can watch TV and I was like, OK if you bring some food and he was like, Thai food? So he came over and we just hung out. What about you?

You: I was like, really tired too, but I had to meet some friends of John's who are visiting. They were like, we want to have tapas and I was like, it's going to be hard to find a table and they were like, that's no problem, we don't mind waiting, and I was like, I do, but I was cool about it and finally we found a place by their hotel.

***

This is a way of speaking that is very common among young Americans (people in their 20s or younger). It may seem strange to you, but once you learn to hear it, it will be easier to understand people when they speak. You can also start using this sometimes... it's very colloquial!