Explanation: This is the girl's dimple when she eats ice cream.

This explanation humorously highlights a charming, perhaps unintended feature of the girl's expression when she's enjoying ice cream. The "dimple" might actually refer to a spot of ice cream on her cheek or an indentation on her face that appears when she's smiling or savoring the treat.

It could also imply how eating something she loves, like ice cream, brings out her joy and personality. Her happiness might cause her dimples to become more noticeable, adding to the endearing moment. Alternatively, if it's not a literal dimple, the phrase might whimsically describe how ice cream leaves its "mark" on her, reflecting the playful messiness of enjoying such a dessert.