TL;DR
Anybody using this as a 'witty' response will be:

In the first instance: banned from all internet boards
For a second offence: refused the right to vote in anything important
And for the third strike: shot.

And anybody responding to this post with TL;DR will be summarily shot for attempting to be clever. Go on... try it.
(mongothemagnificent knows where you live, Sun 25 Sep 2011, 16:20, 22 replies)

I couldn't be bothered to read all that.

( Maffers I flow kinda strange like Spina Bifida footprints, Sun 25 Sep 2011, 16:27, closed)

There's far too many words in this for me.

( Amorous Badger NAKED BEA ARTHUR PHOTOS 4U, Sun 25 Sep 2011, 16:29, closed)

Fucksocks...
Foiled by that old b3tan wit again!

However, assured in the knowledge that you had actually read the original post, I'm happy to walk away with my dignity intact.
(mongothemagnificent knows where you live, Sun 25 Sep 2011, 16:36, closed)

As an example of where it might be appropriate
I will submit this as the longest (and possibly strangest) B3ta post I've ever read. Although maybe it comes under "Wish I hadn't read".
( Hdjejjwsjdjjf LOOK, Sun 25 Sep 2011, 17:21, closed)

Oh God, why did I read that...
(MrBiscuits, Sun 25 Sep 2011, 23:14, closed)

It's somehow hypnotic

( Hdjejjwsjdjjf LOOK, Mon 26 Sep 2011, 1:26, closed)

Horrifying
yet beautiful...
( Rev. Jayneflakes Buy my book, I need the cash for drugs and hookers, Tue 27 Sep 2011, 12:37, closed)

I don't even know what that means. Am I the only one?

(GingerIrishTosser isn't dead yet., Sun 25 Sep 2011, 17:40, closed)

yes.

( janet aylia y'all motherfuckers need jesus, Sun 25 Sep 2011, 17:53, closed)

TL;DR

(SlantedScience, Sun 25 Sep 2011, 18:14, closed)

It means Too Long; Didn't Read
It's the standard response from the attention-deficit generation who are too self absorbed to consider any opinion but their own but simultaneously feel compelled to comment on everything.

Fortunately when Thomas Paine published The Rights of Man, Darwin published On The Origin of Species, and Newton published Principia, they decided not to do so on internet message boards first.
(mongothemagnificent knows where you live, Sun 25 Sep 2011, 19:09, closed)

Beautifully put.

( Ring Of Fire A petty, drooling belming butthurt retard., Sun 25 Sep 2011, 19:22, closed)

But those authors actually had something to say.
They weren't narcissistic bores who never used ten words when they could use a thousand, were they?
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Sun 25 Sep 2011, 20:22, closed)

I don't know either.

(Captain Spacker I lick windows, Mon 26 Sep 2011, 13:36, closed)

Excessively lengthy, perusal declined

( drimble he'd been white, he'd been black, Sun 25 Sep 2011, 21:04, closed)

TL;DR

( mictoboy shitting in your cunt since, Sun 25 Sep 2011, 21:36, closed)

too short; read it twice
( enoughblueskyforsailorstrousers, Sun 25 Sep 2011, 21:43, closed)

Is that an internet threat?

( The Mock TurtIe ™ --- Thinks you are a cunt, on, Sun 25 Sep 2011, 22:34, closed)

You failed to add the standard
"Length?" joke at the end of your post.
(Misery McUglywife an attention seeking sociopathic fuckstain., Sun 25 Sep 2011, 23:21, closed)

Cool story bro

(Cloudane, Mon 26 Sep 2011, 0:06, closed)

You're much cleverer than the rest of us.

( Je suis un vagabond is an unfunny, up your own arse middle class knob, Mon 26 Sep 2011, 8:17, closed)

TB;DC

(Falstaff's Spiritual Successor, Tue 27 Sep 2011, 9:20, closed)