It is a secret word to extinguish castle of Laputa. I think you saw it at the news today. It is because the Ghibli movie "Castle in the sky" （天空のラピュタ）was on TV last night( friday night). i'll reccomend to watch the movie if you understand it well.

バルス　is supposed to be a majic word used in the animation ラピュタ. when you say バルスmeans be broken to pieces or something like that.

バルスは、国民的アニメの天空の城ラピュタの名台詞。 バルス is well known words in the animation 天空の城ラピュタ, it is a famous anime in Japan. 前回のテレビ放送時にTwitterサーバに負荷をかけて停止させたことで、更に有名になった。 The words stopped the server of Twitter when the anime was broadcasted on TV two years ago. And バルス became more famous. 今回のテレビ放送時には、お祭り気分で、面白半分に、Twitterや2ch、ニコニコ動画などに書き込んだ人が多かったと思います。 The day before yesterday, many people in Japan write the words to Twitter, 2ch ,ニコニコ動画 and so on in a festive mood. 自分もTwitterで呟きました。 I writed it too. ^_^ see also 参考に： http://nlab.itmedia.co.jp/nl/articles/1112/10/news009.html