I found this thread trying to remember the rhyme myself.
If I'm not mistaken the version I learned went like this:

ABC!
As easy as 123!
My mama takes care of me.
Ooh. Ah. I wanna piece of pie.
Pie's too sweet; I wanna piece of meat.
Meat's too tough; I wanna ride the bus.
Bus too full; I wanna ride a bull.
Bull too black; I want my money back.
Money too green; I wanna jelly bean.
Jelly bean ain't cooked; I wanna read a book.
Book ain't read; I wanna go to bed.
Bed ain't made; I want some lemonade.
Lemons too sour; I wanna take a shower.
Shower too cold; I wanna piece of gold.
Gold too shiny, so kiss my behiny!