I suggest the following:
You putrid Nimrod.
You vain Dweeb.
You dandruff licking Uggo.
You cat harassing ***-Sucker.
You unwashed Dick-Gnat.
I'll slap you so hard, your clothes will be outta style, you wimpy hick ... Bubba!.
I banged yer mom, you illiterate trailer trash ... Well, sub-divide me and kentucky-fry me!.
This'll jar your preserves, you cross-eyed wife beater ... Bubba!.
I'll throw you in the outhouse, you wimpy white trash ... You is like a booger that you can't thump off!.
I'll slap you so hard, your clothes will be outta style, you sister bangin' trailer trash ... Bubba!.
This'll jar your preserves, you buck-toothed trailer trash ... Bubba!.
This'll jar your preserves, you beer bellied critter ... Well knock me down and steal muh teeth!.
Git mah gun, you wimpy redneck ... Well, sub-divide me and kentucky-fry me!.
I banged yer mom, you lard eatin wife beater ... Well, sub-divide me and kentucky-fry me!.
I'll throw you in the outhouse, you illiterate white trash ... You is uglier than a lard bucket full of armpits.