Sofa : First reply (mainly used in chinese forums).
Origin 1 :
In some early chinese forums, a person started a thread to share some sexy pictures.
Someone then replied, "Very nice, going to sit on sofa and PCC".
From then on, whenever some good pictures were shared, people will post "sit sofa".
By and by, noble people who do not know the original meaning, thought that "sofa" refers to the first reply posted.
Origin 2 :
"首发"which means first post, sounds like "Sofa"
https://hydro73.blogspot.com/2009/08/uniquely-singapore.html?m=1
Origin 1 :
In some early chinese forums, a person started a thread to share some sexy pictures.
Someone then replied, "Very nice, going to sit on sofa and PCC".
From then on, whenever some good pictures were shared, people will post "sit sofa".
By and by, noble people who do not know the original meaning, thought that "sofa" refers to the first reply posted.
Origin 2 :
"首发"which means first post, sounds like "Sofa"
https://hydro73.blogspot.com/2009/08/uniquely-singapore.html?m=1