拐卖伯贤专业户
[guăi mài bó xián zhuān yè hù]
'Baehyhn specialist' literally. Baehyhn may refer to Korean idol Baekhyun. It's probably used ironically to describe themselves jokingly as if they specialize in deceiving or manipulating fans. It could also relate to shipping (pairing up characters/idols together as romantic couple) culture in fan circles.