Oh sure, you can always rely on the ever amusing 'eat my balls', 'lick my balls', 'do something to my/your genitals'. After all, they were good enough for Mr. T. However, most *people* (apart from the professionally religious, or offended) are quite immune to this form of verbal assault now.

I am not in any way against abuse involving references to genitalia (heavens forfend!), but I do feel that the whole paradigm needs a little work. Try adding a smidgen of 'the literary' or esoteric to your nether regional hostility.

The Service Industry:
Brighten up your incessant drudgery and growing hate for others with the feeling you can only get from some whinging idiot's blank moon face of total incomprehension: "I'm sorry, I would *really* have liked to make you a better double choc half-caff unskimmed yak milk mega-cappucino, but my balls are currently experiencing an extreme failure to care....".

Women are also encouraged to play games in contemporary society: "If you attempt to make one more shit-finicky change to the dishes plainly written on the menu, I am going to exercise my own culinary creativity, and add 'a portion of the waitresses' yeast infection' to the list."

Troglodytes believe that you *need* to procreate with them..right now!:
Saying 'fuck off you cock' is immensely gratifying in the short term...but it's not exactly going to get you through the tough post-apocalyptic times ahead. Something to suit the festive season perhaps?: "Yes, I *will* get jiggy with you like three kinds of marmalade, right after I lovingly cut off your scrotum with a broken christmas decoration, and kiss it beneath the mistletoe, k sweety?".

Or you may have some zoological leanings. There are just too many examples combining monkey and a reference to genitals to go into. Experiment; get crazy naked with words and rub strange combinations of them all over yourself like lemon butter. Then go forth and offend!

Just some more incomplete suggestions on how you could better live your life.