No idea how the story relates to the internet 顾茫(gu mang) and 墨熄(mo xi) are names 在线 means online 脱衣 means to strip off clothes (cuz that's what gu mang did) and i expect the same for mo xi
It's a meme/forum thing. (See posts above for more) 装逼 = acting pretentious/cool. Usually in a negative way like trolling, boasting or (commonly seen) putting on a cheesy "I'm the cool kid" airs. Maybe: Sexy A, stripping online. Sexy B, acting cool.
This is a meme. Adult content is illegal in mainland China( But it's basically for people who make money from adult content) , so adult website operators will build servers abroad. Because of this, they will receive financial support from advertisers who may be illegal or fraudulent. Those online gambling websites attract customers with the slogan "性感荷官，在线发牌( Sexy Dealer, Dealing Cards Online) " in various adult forums, pirated adult movie titles and popups. As long as you try to watch these things in mainland China, you will always see this sentence. So, everyone knows what happened afterwards.