This is the 13455th most frequent Turkish word.
konusuymuş
It means "it was about" or "it was the subject/topic of."
'konusuymuş' is used to indicate that the topic of the event was understood or reported, but not directly experienced.
O etkinliğin konusuymuş.
It apparently was the topic of that event.
'konusuymuş' here hypothesizes about the topic of the movie to express speculation or imitation.
Filmin konusuymuş gibi konuştu.
He spoke as if it was the topic of the movie.
'konusuymuş' indicates hearsay about the subject matter of the book.