It literally means that the writer (he/she) has a really deep feeling - a really deep love for a person and so he/she expressed his/her feelings in this song.
This song is really making everyone that reads and even listens to it "baper" or "bawa perasaan" or it means really takes feelings for this to listen. So can you guys even imagine what that means? It means that the writer really really use his/her feelings to write this song.