A child, typically a fatherlessteenager who doesn't have any siblings nor someone to cope with when they are down.
"u are single-child lol" Suck it kid "U have no grills??"
"go away you stupid twat"
"Get lost, you single child"
"Bruh really your an only child?"
"You're alone"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi