萌比艳子出墙灭婊
[méng bĭ yàn zi chū qiáng miè biăo]
This username seems to be a mix of provocative and somewhat aggressive words. '萌' (meng) means cute, while '艳子' (yanzi) implies attractiveness, possibly referring to an attractive girl. '出墙灭婊' has derogatory connotations about betrayal or getting rid of someone, which might not translate well in English.