When a guy bites your arm, what does it mean?

Anonymous
so a bunch of us from school went out on a trip, and in the group there is this guy who admitted to being attracted to me. However, we try to keep things light, we flirt and joke but that's about it. So as I was talking to people he snuck up from behind and playfully bit my arm. I was wondering if this gesture has more to it than being playful ?
When a guy bites your arm, what does it mean?
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