A limerick is a poem consisting of five lines, although sometimes people chain together multiple limericks to tell longer a story. The rhyme scheme is aabba, and while the amount of syllables for the lines vary, the third fourth lines are often much shorter than the others. The important part of the limerick is having the first, second, and fifth verses match a rhythm of "ta ta tum." That's a bit harder to explain, so let's take an example:

There was a JADEd young JACK from LaVAL /
Stuck with NAUGHT but his NIB in NorCAL / 

Here, JADE, JACK, and VAL are the "ta ta tum," as they're the words on which the beat of the limerick lands. Similarly, NAUGHT, NIB, and CAL.

Also, an important part of a limerick is that it's  naughty in some way— but I doubt you'll find that here, as these poetry postings are nothing if not clean and family-friendly.


The Swindle
A Jack on the run with his partner in crime / 
A doxy of moxie who's sly as he's spry /
Though puckish and roguish and long past his prime /
He's adroit at deception, proven to pry /
Tod's a flibbertigibbet who does nothing but lie /

Holed up in hiding after hatching a heist /
The plan had gone poorly, thus surly was Jack /
Crew carelessly caught and most certainly iced /
He brooded, reviewed it, and thought, looking back /
Tod should've hastened to chasten, but cut Jack his slack /

Reflecting on Tod, Jack found him suspicious / 
Could he have decided he'd much more to gain?
Thwarting their thieving seemed somewhat auspicious /	
Could he be the reason his mates had been slain?
Could he have conceived of this legerdemain?

There was a knock at the door, and with cuffs he'd been boxed /
Jack cursed and he stumbled; out by Tod he'd been foxed /

Now Tod's on the loose, and he's slicker than slime / 
While his ex-partner Jack is stuck doing time.


Limericks are like foxes: enjoyable, easy, and fun to pass around.
Wait.


Reciprocity
Said Jack to Tod, "You know...
I top for you a lot, and so,
I could use a good dicking,
You deserve a good licking;
So my dear, would you care for a blow?"

Said Tod to Jack, "I think,
That I could be brought to the brink,
So get on your knees,
Oh, pretty please..."
And Tod had out his cock in a blink. 

While Jack's muzzle licked its way down,
Jack's paws started going to town;
Tod gave him the 'biz,
And soon he did jiz,
So Jack swallowed and grinned like a clown.