我从小缺钙
[wŏ cóng xiăo quē gài]
'Since Childhood, I Have Been Lacking Calcium'. Besides the literal meaning pointing out a health condition of calcium deficiency causing various troubles since childhood, this nickname humorously hints at the owner's vulnerability or shortcomings that he or she finds hard to make up for. Sometimes, used in a light tone reflecting some quirks or flaws they have come to accept about themselves.