我在你的世界里猖獗一辈子
[wŏ zài nĭ de shì jiè lĭ chāng jué yī bèi zi]
Expresses a bold desire, implying 'I want to run wild all my life in your world,' meaning deeply intertwined lives and emotions. Here, 'world' refers more figuratively to the other's influence or heart rather than reality. 'Run wild' means to do things freely without restraint.