What does it mean if a guy says `We should grab a coffee sometime'?

Anonymous
Hi, so I am 24 and was working at a restaurant. A guy from high school (also 24) came in with his parents for dinner.

After they finished, his parents left and he came up to pay for the food. He then asked me how I was and what I have been doing since I left school. He seemed to remember where I went to on vacation when he came to the restaurant 3 years ago, which is creepy. But we seemed to get into a good conversation but was interrupted by another customer who was waiting behind. He quickly said `I better go, but we should grab a coffee sometime.' I said `yeah definitely' and then he left.

What does this mean? Did he just say that because he didn't want to be rude because he had to cut the conversation short, or does he want to grab a coffee sometime? I have him on facebook so he can easily contact me.

Thanks
What does it mean if a guy says `We should grab a coffee sometime'?
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