I heard the "filthiest Limerick Ever" this way: It was told to my Dad just after WWII by none other than Winston Churchill.

"It seems that the BBC wanted to lift the spirits of the British people during the war and one idea they had was to have a limerick contest. The winner would receive 100 Pounds and his or her limerick would be read on the radio all over the English speaking world. Thousands of entries poured in and finally the winning entry was chosen. Of course, because it was the BEST LIMERICK EVER, it embraced the traditional logic of "there are good limericks and there are clean limericks, but there are no good, clean limericks." So the BBC was in a bind. They knew, from the start, that they'd have to use language not heard on the BBC normally, but this limerick used words with which even the creators of the O.E.D. were only haltingly familiar. The BBC comprimised with the poet and decided to "beep" out the most offensive words and hope that the limerick would remain intact. So after many hours of work this is the limerick as it was presented on the BBC:

Beep, beep-beep-beep-beep, beep, beep Beep, beep-beep-beep-beep, beep, beep Beep, beep-beep-beep-beep Beep, beep-beep-beep-beep Beep, beep-beep-beep, fuckin' cunt.

pax yall