薄凉少心皆口开
[bó liáng shăo xīn jiē kŏu kāi]
The phrase suggests a somewhat indifferent and emotionless characteristic ('cool/thin' literally means lack of enthusiasm here), 'few thoughts' implies carelessness or thoughtlessness, 'all mouth open' symbolizes someone prone to gossip or unable to keep secrets well. So it means the user sees themselves or someone else as emotionally aloof and gossipy, revealing information loosely or casually.