What does it mean when a guy jokingly calls you "baby"?

MercedesXx
Okay, so this guy that I've liked for a while now has been showing some kind of interest again, like we poke each other and mess around like that, then during the class that I have with him he texts me saying I'm a nerd, I called him a dork, then he responds with "Thanks baby" and I don't know what that means...
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+1 y
We were in Science, and he asked me for a pen, and so I lent him one and he said "thanks babe, appreciate it." and I feel like he likes me, he is on and off with the flirting.
What does it mean when a guy jokingly calls you "baby"?
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