@warandpeas There is a traditional basque song that says "aldapeko sagarraren adarraren punta, puntaren punta, txoria zegoen kantari: xiru liru li xiru liru li" (At the tip of an apple tree branch on the hillside, at the tip of the tip, there was a bird singing: xiru liru li xiru liru li).

I'm sure that "xiru liru li" means "I am the shit".