< looks at thread above this one >
Penury
spumy.
{a frothy matter on liquids}
formicate: to swarm like ants
Tell them you just got back from the mall where you formicated with thousands of other poople.
Once I wrote a pornographic story which included the word coccyx. Everyone who read it thought I’d discovered some perverted body part heretofore unknown to mankind. 
Scotus
Potus
Cloff, prunk, shote, cucking, skank, fusk, pempslider and pimhole.
Muffin fudger
Fudge packer
Son of a bachelor
Godfrey Daniels (a favorite of W. C. Fields)
Cheese and rice (in case blasphemy is considered cursing where you work)
Cheese and crackers
Blow hole
Belgium (heh, heh)
Shizzle (borrowed from Snoop Dogg)
Firetruck (if you absolutely need that word that starts with F and ends in UCK)
epiglottis
Keep them coming.
I now have an additional assignment. The purveyor of the Curse Jar has decided that some words are worth more than others, so I’m really looking for words that sound very close to the “C” and “P” words which specifically refer to female genitalia.
So far I have:
Counnnnnnntry.
And that’s it.
Yeah, I’m lame.
Posse
Bunt
Regina
posset
pursed
poised
quince (actually used to be vulgar slang for breasts, may currently be so for vagina or for homosexual, depending on the country you’re in)
quaint
Speaking of which, Götterfunken.
This thread reminded me of this from my childhood.
moist
To go along with the Animaniacs quote from above, I’ll offer this from Foster’s Home for Imaginary Friends:
From memory, roughly paraphrased. I may even have the characters backward.
Ah, here’s IMDb’s version:
Fudge packer isn’t dirty? Apologies to those who actually DO pack fudge for a living!
Fother Mucker
Fustercluck
Gits and Shiggles
Spoonerisms are fun! 
Zilch? Is that you?