The point of no return near the vagina or anus. The penis will be attracted to enter either hole, but until it goes beyond that hole's event horizon, sex proper has not yet begun.
However, not going beyond the event horizon does not imply that sex will last longer, as the erotic and sensual forces upon the penis that close to the event horizon can result in premature ejaculation.
Professor: As one approaches the event horizon it becomes harder and harder to keep from entering the black hole.

Student: LOL, harder.
by The6thDegree July 11, 2008
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The definition of a shit that is so large in mass that it rises over the water in the toilet bowl. To do so one must shit so that there is a solid base under the water level.
"I just saw an Event Horizon!"
"What? The movie?"
"No! In my toilet!"
by de Cruz May 29, 2007
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The moment after you ejaculate where you can’t physically go any longer. No matter how hard you try you can’t get past that point, hence “The Event Horizon.”
“I just got to the Event Horizon oh shit *ejaculates the alphabet onto the Brazillian Flag*”
by HeavyHelen August 28, 2020
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The exact moment in time between when a person realizes that they are going to have diarrhea and that it is inevitable.

In physics, the event horizon is the "point of no return" in which an object is caught in the gravitational pull of a black hole.
I'm having an event horizon and need to find the bathroom.
by FerdinandLB July 30, 2011
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The Event Horizon is an "On the Rise" indie band from Connecticut. Formerly known as Penny for Your Thoughts, The Event Horizon was formed late 2008 early 2009. The band currently consists of three amazing musicians: Sara on bass and vocals,Luis on drums,and Ben on guitar. Their myspace page is www.myspace.com/p4yourthoughts.
Person 1:There is no doubt that The Event Horizon is gonna hit it big one day.

Person 2:Duhhhh!
by xXGionaGuillotineXx May 27, 2009
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The original definition is:
"The gravitational sphere of a black hole within which even light cannot escape"
-Wikipedia

However, recently, a new definition has risen meaning something completely different:
The Event Horizion is the point at which a person is too drunk or stoned to be able to function properly, yet alone remember anything the next day.
Example:

Dude 1: *takes-drag-from-J*
Dude 2: "Oh shit, you don't look so well..."
Dude 1: *falls-off-chair,-blissfully-passes-out*
Dude 2: "Damn that lucky bastard, he just passed the Event Horizon!"
by Fabian G December 23, 2008
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the area on the side of a girl's face where her make-up partially blends with her actual skin, though still in a very noticeable way.
T: hey did you see Maria yesterday?
N: yeah she had an event horizon going on.
T: i know it was so nasty.
by Dennycrumbubble November 17, 2010
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