This can only consist of ones YOU made up.
My offering:
There once was a butcher called Sam
Who boinked his new wife with a wham!
He spooged on her belly.
It was pretty smelly,
But least there was glaze for the ham.
There once was a jester named Bung
Who was quite unusually hung
He saw, ripe for picking
A candidate for squicking
And later on he would perform mung.
There once was a poster named SPOOFE
Who stood naked on the roof
He ran after a horse
with the intention of course
of not feeling the kick of it’s hoof.
[sub]Ok so it’s not that good, hey it’s not even that dirty but it has a naked SPOOFE and a horse, you can let your imagination do the rest
sorry SPOOFE.
There once was a girl from Nantucket…
shit
forgot the rest…
My apologies for the previous post antics!
Now, let’s play Name That “Poet”, shall we? :
Hickory dickory dock
Some chick was sucking my cock
The clock struck two, I dropped my goo
I dumped the bitch on the next block
There once was a girl from New York
Propositioned by this short little dork
She said to this guy
“Man, you MUST be high
No way you’ll get to poppin’ my cork!”
A young puppy who we shall call Spot,
Go potty outside? He would not!
Behind the couch he would sneak
And take dumps for a week.
Only your nostrils suspected the plot.
A young bulimic stargazer named Mae
After ten Snickers bars, started to sway.
“I’ve not had to vomit
Since last Halley’s comet,
Now here comes my OWN Milky Way!”
There once was a man from Nantucket
who kept eleven brass balls in a bucket.
he used to have twelve
but amusing himselve,
He lost a ben-wah where he stuck it!
I heard Debbe was to build a saw horse.
Now Ms. Dunning is quite a stunning force.
My Tool Time surprise
came when she winked with her eyes
and asked me to inter her course.
I made this up this morning! 
There once was a woman from Mass.
Who really could’ve used a piece of ass
She tried her best to be sweet
To the local meat
But alas, they found her too crass!
Donna Z in MA
There was a Zombie from 2001
Unnecessarily woken up in 2011+1
I want to sleep, the thread said
Then go back to sleep, mods said.
There once was a Zombie named Fred
Who liked to have sex with the Dead
First he’d eat all her brains
then fuck her remains
and that is the end of this Thread
The only two that I know:
There was a young maiden named Jill
who tried a dynamite stick for a thrill
They found her vagina in north Carolina
and bits of her tits in Brazil
(pause)
There was a young man from Nantucket
whose dick was so long he could suck it
He said with a grin (while wiping his chin)
“If my ear was a cunt I could fuck it”
.
There once was a zombie articulate.
('Twas executed for telling lewd limericks.)
Although he was hung,
He could still with his tongue,
Perform cunning linguistical tricks.
There once was a thread long forgotten
That got bumped from a page near the bottom
After 10 years or more
We were shocked when we saw
That the limericks were thoroughly rotten
The limericks in here should be criminal
they’re not subtle nor even subliminal
But I have to admit
since they’ve aged quite a bit
It gives weight to the title’s “original”!
A young woman from the Azores
Had a twat quite infested with sores.
The dogs in the street
Used to suck the green meat
That hung in festoons from her drawers.
Thank you Isaac Asimov!
Yeah, I know this isn’t original, but on a zombie thread this old, who’s going to complain? 
There once was a young man from Kent
Whose dick was incredibly bent.
But it gave him no trouble
He just shoved it in double
And instead of coming - he went.