钩钩手许下属于我们的诺言
[gōu gōu shŏu xŭ xià shŭ yú wŏ men de nuò yán]
In Chinese internet slang, it represents making an agreement by linking pinkies together (making a promise). The meaning here is: 'Make a promise belonging to us with hooking hands,' indicating someone cherishes some precious vow with another.