欺负我就把班主任嫁给你
[qī fù wŏ jiù bă bān zhŭ rèn jià jĭ nĭ]
This username employs a rather amusing and exaggerated threat or warning. 'If you bully me, then I'll marry my class teacher to you,' which means it is using a scenario nobody would actually want - being forced into marrying someone older (or not attractive in their opinion), as a form of retribution for bullying the speaker.