刀枪不入百毒不侵
[dāo qiāng bù rù băi dú bù qīn]
This nickname means 'Invulnerable to Weapons and Poisons', depicting a person who believes they are unafraid of external threats or challenges in life. It implies invincibility, resilience, or the desire to face hardships courageously. This can also hint that one is emotionally strong and not easily affected by others.