Our version (Oklahoma, 1950s) of 'Greasy Grimy Gopher Guts' went
Great green gobs of greasy grimy gopher guts
Mutilated monkey meat, dirty little birdy feet,
Sneezed-up snake snot, bashed in beetle brains,
And me without a spoon (but I got a straw!)
Actually I more often heard 'mutilated monkey meat, petrified parrot urp' which sounded suitably disgusting but did not rhyme. ('Urp' was kid-colloquial for 'vomit')
And we ended all the almost-rhyme ones (--- had a steamboat etc.) with
Behind our icebox is a piece of glass
If you sit upon it, you will cut your
Ask me no questions, I'll tell you no lies,
If you don't open up your mouth, you won't catch any flies.
I wonder why all the ones above mention glass but if you sit upon it you will break your [ask]? Cut makes more sense.