我是你的大大大傻瓜我是你的小小小笨蛋
[wŏ shì nĭ de dà dà dà shă guā wŏ shì nĭ de xiăo xiăo xiăo bèn dàn]
An adorably self-deprecating username expressing deep care and submission towards a specific person or beloved one. Here 'big big big fool' and 'tiny tiny tiny idiot' imply playful foolishness dedicated only to the beloved one.