上頭 [shàng tóu] means “(of alcohol) to go to one’s head.” Intoxicated sisters refer to female fans who are so psyched about the sweet romantic scenes in Internet novels, idol dramas and online photos that they simply go bananas!
This slang term is made popular by the TV drama Go Go Squid! which took the country by storm in the summer of 2019. I gave up on the drama after watching a few video clips, because Li Xian’s character Han Shangyan has an annoying poker face and is too dominant in the relationship.
Go Go Squid! is one of those popular 甜寵 [tián chǒng] “sweet and pampering” idol dramas which are replete with sweet romantic scenes where the male lead would do anything for the female lead.
商業互吹 [shāng yè hù chuī] v./n. Commercial+mutual+flatter. To praise each other just for commercial or pecuniary purposes. It’s often used to tease movie stars who praise each others when on press tours, because they kind of have to.