灭婊大队大队长
[miè biăo dà duì dà duì zhăng]
'灭' stands for eliminating or getting rid off, '婊' usually describes women of easy virtue, here expressing a strong disdain or dislike for certain improper behaviors; '大队' and '队长' refers to the leader of a specific organization. Overall this internet username might be joking about oneself or emphasizing a strong stance on a moral issue. However, please note that this word '婊' has negative connotations and may be considered inappropriate in public communications.