"A cup of American coffee" literally means drinking a cup of American coffee. And everyone brought him an extended meaning, because American coffee is bitter, not very delicious, but bitter with sweet. So people often use it as a metaphor for painful things. So I think according to his meaning, "half a spoonful of sugar" can be used as its screen name for lovers.

Another understanding is that there is a Tik Tok account named "A Cup of American Style" on Tik Tok, which mostly contains love stories with poor endings, which makes people feel like drinking a cup of iced American style, but another account named "Sanjin Qiqi" is the same actor, but the content is quite different from "A Cup of American Style". They are all sweet love stories. So I think "three golds and seven seven" can also be used as the screen name of "a cup of America" couples.