你的爱情关我屁事
[nĭ de ài qíng guān wŏ pì shì]
It expresses an attitude of not caring or having indifference towards someone else's romantic affairs. In this context, '爱情'(love) is being explicitly dismissed as irrelevant and unworthy of attention, using somewhat crass and colloquial language to reinforce the feeling of apathy.