Why looking up the lyrics can be a good idea

"La Cucaracha, la cucaracha, ya no puede caminar. Porque le falte y necessite marijuana a fumar."

The story is that this song was written about Pancho Villa's car. It means "The cockaroach, the cockaroach, can go no further. Because it's lacking and it needs marijuana to smoke."

... and now you know.