A guy calls me mama. What does it mean?

The guy is actually Arab but born and grew up in US. He calls me mama or sometimes mother even in public. I don't mind the mama but the mother bothers me. We had date twice but usually text each other. I don't know if it is a sarcasm or disrespectful. He's very straightforward person and always jokes on me.
A guy calls me mama. What does it mean?
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