It is a word of the Basque language, which has different meanings. It can mean corn, cob or also gross, donkey, stupid, stupid, idiot, squeaty. Another possible meaning is craftsman, worker, worker.
Stupid, foolish, borono, dumbass. It comes from the union of two words in Basque "arto" - corn and "buru"-head, and has double acept, on the one hand, means cob and on the other hand, it is an insult that is emplied to refer us to people boronas or bobaliconas.