The thin line that exists between a story and reality. When a character in a story tells the reader in some way that they know that they are a character in a story, that is called 'breaking the fourth wall'.
Character 1: The author is a jackass who can't write me properly.
Crashing noise
Character 2: Well, there goes the fourth wall.
by Kyo Kusanagi July 7, 2003
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The day people light things on fire, and blame it on loving their country.
police officer: hey, you kids, that type of fireworks is illegal!
kid: dude, its the fourth of july. just showing some love for my country.
police officer: oh. in that case. toss me an m-80.
by ouirewoi July 4, 2007
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A second third wheel, usually used to balance out a third-wheel situation; someone added to a group of three so no one is left alone.
Jimmy: "Hey Bobby, you should invite George as a fourth wheel so that Harold isn't left out."

Bobby: "Yeah, I'd hate having to leave Harold as a third wheel."

Harold: "Thanks, I think."
by catsonmeth October 17, 2012
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In theatre, the side or sides of the set facing the audience that have no physical reality. The audience and actors aknowledge this deliniation as a convention of theatre, unless the director chooses to "break" the fourth wall.
by Andrew January 20, 2005
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The term Fourth Estate refers to the press, both in its explicit capacity of advocacy and in its implicit ability to frame political issues. The term goes back at least to Thomas Carlyle in the first half of the 19th century.

None of our political writers ... takes notice of any more than three estates, namely, Kings, Lords, and Commons ... passing by in silence that very large and powerful body which form the fourth estate in this community ... The Mob.3
by bclark86 August 7, 2008
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Fourth revival of ska music (the original being in jamaica in the late '60s, second wave or two-tone surfaced in the late '70s, and third wave hit in the late '80s and early '90s).

Many claim that the fourth wave is imminent, ready to appear anytime between now and the early 2010s.

Others claim the 4th wave is already here, heralded by Tomas Kalnoky's band Streetlight Manifesto and side project Bandits of the Acoustic Revolution. (There is a streetlight manifesto song titled "riding the fourth wave")
While some people are excited about the fourth wave of ska, others worry that ska is too diluted and growing farther from its roots.
by Rude girls have more fun November 13, 2007
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