A number of meme songs come to mind but the first one to pop into my head is Galactic Mermaid from the anime Carole and Tuesday. It's just this catchy upbeat song that's literally just expletives haha.
As a Death metal vocalist and avid metal fan this is honestly something I can completely understand. At least you gave the genre a go rather than dismissing it.
I have to go with the title screen theme from Crazy Bus. It’s just a bunch of random notes being blared from an NES. There’s no consistency or melody. Just random ear piercing bleeps.