姑娘坚强吊炸天老子疯狂无人敌
[gū niáng jiān qiáng diào zhà tiān lăo zi fēng kuáng wú rén dí]
The phrase means a girl claims she's so tough and a boy boasts he is mad to the point of invincibility. It shows an attitude that the user sees him/herself as very strong, independent, and somewhat rebellious or crazy without rivals. In a broader cultural context, it reflects self-mockery and exaggeration which is commonly used in internet language by Chinese teenagers.