The quote reflects on the unexpected charm of a person's smile, suggesting it's both surprising and captivating. The speaker acknowledges the overwhelming effect it has, implying that such a smile can momentarily take one's breath away or even strike a deep emotional chord.
This remark also hints at vulnerability, suggesting that if one were open to feelings of affection, such a smile could have a profound impact. The overall impression is that genuine warmth and charisma can be disarming, creating a moment of connection that resonates on a deeper level.