小三那是我不要的男人
[xiăo sān nèi shì wŏ bù yào de nán rén]
Here, it refers to the kind of man who would become a third party or 'cheater' as someone unwanted or despised, meaning 'The kind of men like a cheater are those I do not want'. It conveys disgust or disappointment with certain types of people or situations and might come from an attitude rejecting involvement in unethical scenarios or relationships.