fourth wall 

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.

An actor making eye contact with the audience is breaking the fourth wall.

fourth wall by Andrew January 19, 2005

Fourth Estate 

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

Fourth Estate by bclark86 October 3, 2008

Fourth Pipe Bimbo

Noun - A fourth pipe bimbo is a word originating from the YouTube channel GameAttack. It refers to someone who plays so poorly in a game or event (usually Mario Party) that they frequently get fourth/last place

Good job getting last Greg ya freakin fourth pipe bimbo.

Fourth Pipe Bimbo by ExpectingBird February 17, 2018

Fourth Wave

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.

Fourth Wave by Rude girls have more fun December 8, 2007

fourth base 

The final stage in a relationship that involves sexual intercourse.

First Base -- Making Out (tongue included)
Second Base -- Rubbing, Dry Humping, grinding.
Third Base -- Oral Sex
Fourth Base -- Sex

"I can't believe it, he got to fourth base on his first date with her!"

fourth base by Cloud Infinity December 24, 2006

Fourth point of contact 

Airborne military term for your ass. The five points of contact for landing after a parachute jump are (in order), 1. balls of feet, 2. heels of feet, 3. thighs, 4. ass, and 5. shoulder blades.

Term usually used to describe one who needs to pull their heads out of their ass.

"Ssg. Harston hasn't put my leave request in yet."
"Well, he better pull his head out of his fourth point of contact and get cracking on that!"

Fourth point of contact by TheGlorious1 January 1, 2010

Fourth Dimensional Bong Hit 

A bong hit so potent, so fierce that it trancends space and time, making you instantly stoned.

(Cough, cough) That was quite the Fourth Dimensional Bong Hit. (Slam, falls to the floor)

Fourth Dimensional Bong Hit by MC BallSac March 12, 2006