It’s an old sailor song. It was recorded in a garage. They couldn’t afford a mic stand so they hung the mic from the ceiling. The singer said he’d have to stretch and even stand on his toes and that’s why no one could understand the song except the band because they knew the lyrics. I saw the singer explain this in an interview. The record label allowed people to think whatever they wanted to think. The teens thought they were getting away with something when they bought the record. You can look up the actual lyrics.
Louie Louie was written by Richard Berry, who was also with the Robins/Coasters. He narrated “Riot in Cell Block No. 9” IIRC.
The lyrics in the Berry version are Caribbean patois but entirely understandable.
https://www.youtube.com/watch?v=z-2CKsaq5r8
If you know the words Berry wrote you can hear most of them in the Kingsmen’s version.
The RICHARD Berry song was inspired by an earlier CHUCK Berry song, Havana Moon. Whether Havana Moon was an old sailor song I don’t know.