天塌了我还站着就砸不到你
[tiān tā le wŏ hái zhàn zhe jiù zá bù dào nĭ]
The literal meaning of this nickname is 'If the sky falls, I will still stand, thus won't be hit on the head'. The user probably means 'whatever challenges there are, even if something terrible happens such as the sky falling down, I will still remain upright so that the problem can't impact you.' It conveys resilience and the intent to always protect someone or be supportive.