"Buenardo" is a modification of the word "good" of Spanish. As for meaning, they are exactly the same. Looking morphologically at which words had been mixed to create the word, I learned that the word was invented and popularized by a streamer called Coscu. The same goes for saying that something is terrible. You can say that something is "malardo", and it can be accepted as a word. . .
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
