待我强大我定抄学校
[dài wŏ qiáng dà wŏ dìng chāo xué xiào]
'Once I get strong enough, I will definitely challenge my school.' This implies a kind of rebellion spirit. The person may feel aggrieved by their current situation (like being bullied, misunderstood etc.), so once the person gains strength/power/authority, they'll challenge whatever makes them unhappy (like a bad system at school). Note: It's often meant humorously or emotionally rather than literally