你丫的换女人比换衣服还勤
[nĭ yā de huàn nǚ rén bĭ huàn yī fú hái qín]
This translates to 'You change women as often as you change clothes,' expressing disapproval towards someone (probably a male) who frequently changes partners. This carries a rather vulgar tone of speech but also serves as an expression of exasperation or sarcasm by the person giving the nickname.