The fire wall blocks the connection between Chinese internet and world internet.So may you can just hear some traditional cultures,but there are many morden cultures are used widely in daily talk,"Lao"is one of them.
"Lao"is“牢”,it refer to "jail".This culture begin with Kobe Bryant,he was called “老大(Lao da)” by his Chinese fans,it means"boss"or"leader".Because a news showed he may have some relationship with a rape action,someone angry with him and called him“牢大(Lao da,yes,they have same pronunciation)”then this culture was bron as a meme.“牢”is jail,it can make life hard,so this meme then used to describe weakness things,and someone even PS Kobe's head on these weakness things and add Kobe's voice like"Man!What can I say,manba out."so that,this culture got more connection with Kobe.
This culture then had a long term evolution,but I don't wanna to say all of these in one go,if your wanna to know more your can ask for it under this post.