把刀藏进衣袖把枪藏进风衣
[bă dāo zàng jìn yī xiù bă qiāng zàng jìn fēng yī]
It means 'Hiding the Blade in My Sleeve and Hiding Gun inside My Trench Coat'. It gives the vibe of a covert, potentially edgy persona - someone who prefers stealthiness and being prepared but not immediately showing all their tools or strength.