It's a bit of nonsense poetry from the album "Who Can I Turn To Stereo" by experimental music project Nurse With Wound. For a while it was the band's only album on Spotify, and when I first listened to it, it was just about the weirdest thing I'd ever heard. The dadaist lyrics and song titles really stuck in my mind. The first track, "Tune Time Machine", includes the wonderful wordage:
A great, armored mass of darkness fish was approaching. I had the girl, the records, and the jeweled knife, but he had the time machine.
Later on the album, there's an instrumental track titled "Approaching Darkness Fish", followed immediately by the brief "Darkness Fish", making this cthonic creature an icon of sorts for the album in my mind.
There's no intended connection to science fiction (I chose the name while I was still more active on StackOverflow), despite the lyrics' references to time machine. It's just a weird blurb of absurdist humor from an obscure musician I like.