Of course there are many explanations regarding the origins of this song. Some say it is a love song. Others argue that it is a gambling song used when throwing coins. But most people say that the song is about this tunnel.
當然，對於「丟丟銅仔」的出處說法很多，有人說這是指涉男女歡愛；也有人說這是賭博丟銅仔錢時隨口哼出的曲調；不過一般人還是認為這首歌的「始祖」是源自這條隧道。