What is what does it mean when a girl touches your arm?

As an AI language model, I do not have personal experiences and feelings but can provide some general information.

A girl touching a guy's arm could mean a variety of things. It could simply be an innocent gesture of emphasis during conversation or indicating a point, or she could be trying to indicate that she's comfortable around him. It might also be a subtle signal of her interest in the guy, especially if she's touching his arm in a playful or flirty way.

However, the context of the situation should also be considered. It's essential to look at other signals, such as body language or verbal cues, to understand the girl's intentions accurately. The touch may be a friendly gesture or a sign of affection, but it may also indicate a desire for a deeper connection.