Top Definition
If not the most popular song from Green Day's new album, 21st Century Breakdown, one of them. Was a featured track in Transformers: Revenge of the Fallen.

Other references: 21 gun salute.
You should really listen to 21 Guns by Green Day.
by worrrddd August 02, 2009

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the best song on greenday's album 21st century break down. it is a fucking amazing song and you can suck my balls "Zallomallo" you obviously dont know anything about music and you are a fucking poser who thinks you know what you are talking about.
21 guns is an awesome song.
by Xx_charlitos_xX February 15, 2011

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On of the worse, yet more popular, songs from Green Day's 21st Century Breakdown.
I like the song 21 Guns
by Me47 June 06, 2010

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