to bring one's own; to be self-provided; often used in the context of food or drink (BYO)

solid food or dry provisions prepared for a journey, expedition, or emergency

Turns a word or phrase into a noun-like thing, meaning "the one that..." or "the kind that...".

short for 五毛党 wǔ​máo​dǎng, referring to a person paid by the government to post pro-government comments online