This is the official version that my son learned a few years ago:

Great green gobs of greasy, grimy gopher guts,
Mutilated monkey meat,
Dirty little birdie feet,
French-fried eyeballs rolling down the bloody street,
And me without a spoon.
(I'll use a straw.)

That last line is to the tune of "And man-y mor-rre" that can be added at the end of Happy Birthday.