不读书了当尼姑去
[bù dú shū le dāng ní gū qù]
Means 'If I'm not studying anymore then I should become a nun': Indicating the desire for a quiet, peaceful and tranquil life. Nuns usually devote all their lives to praying and reading Buddhist scriptures in a secluded nunnery. So by this net name, the users could want to convey that he/she hopes to escape from studies or society pressure and live a quiet secluded life. However, this sentence seems slightly exaggerated as casual slang talking.