糠师傅绿茶
[kāng shī fù lǜ chá]
Kang Shifu is the name of an instant noodle brand, whereas 绿茶 often refers to someone who pretends to be naive and virtuous to please others, usually female. So the overall tone of this username can come across as mocking and ironic on the account of juxtaposition between an everyday object/product and a somewhat derogatory label.