伱的百毒不侵我的刀枪不入
[nĭ de băi dú bù qīn wŏ de dāo qiāng bù rù]
'百毒不侵'(immune to all poisons) and '刀枪不入'(invulnerable to weapons) are idiomatic phrases expressing immunity against any attack or hardship. The nickname conveys both parties are very strong, resilient, and can resist harm from each other.