天真岁月不忍欺青春荒唐不服你
[tiān zhēn suì yuè bù rĕn qī qīng chūn huāng táng bù fú nĭ]
'Innocence and youthful days should not be deceived; youth, however outrageous, does not bend to you.' This likely means the user believes they will not let their youthful naivety and carefree spirit be wronged or tamed by someone.