"Fxxk It" (Korean: 에라 모르겠다) is a single recorded by South Korean group Big Bang. It was released digitally on December 12, 2016 by YG Entertainment, as the fifth single from MADE (2016), and ninth song overall from the series.

The music video was filmed in Cheongju, on October 18, 2016. On December 6, the name of the single was revealed with a promotional poster. The song was released on December 13 at midnight KST worldwide on iTunes, with the music video, directed by Seo Hyun-Seung, who previously directed "Fantastic Baby" and "Bang Bang Bang".

"Fxxk It" was written by YG producer Teddy alongside Big Bang members G-Dragon and T.O.P, with production being done by Teddy, G-Dragon and R.Tee, and the arrangement was made by Teddy and R.Tee. The song is a mid-tempo, bouncy and electro-hip-hop song. The members have said that the song came out "when we didn't know what to do and were just sighing", and wanted to express the feeling of immaturity in it. The song's production was noted for being "futuristic," including a "amalgamation of tropical beats, horns and synths."

Upon its release, "Fxxk It" topped four charts on China's QQ Music including the daily, popularity index, music video, and K-pop music video charts. In three days, the song recorded 362,655 downloads and the music video surpassed 2 million views on QQ Music. On Billboard's World Digital Songs, the song charted second with 6,000 copies sold in three days. In Japan, the single debuted and peaked at number seven. In Finland, the single peaked at number 23, becoming Big Bang's highest charting single in the country. "Fxxk It" also entered the Canadian Hot 100, the first song of the group to appear on the chart.

In South Korea, "Fxxk It" debuted at number one on the Gaon Digital Chart, recording the second highest weekly sales of the year after Lim Chang-jung's "The Love That I Committed", selling 325,623 digital copies in five days. The single also debuted at the top position on the Streaming Chart with over seven million streams. "Fxxk It" remained at the number one spot for three consecutives weeks and also topped the December monthly Digital and Download charts with nearly 600,000 copies sold in three weeks.

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