人丑嘴不甜长得危险还没
[rén chŏu zuĭ bù tián zhăng dé wēi xiăn hái méi]
This nickname expresses self-deprecating humor about physical appearance and personality. It suggests that the person is unattractive, not sweet-talking, potentially intimidating in looks, and implies an unfinished thought. It conveys a sense of being flawed or imperfect in multiple aspects.