here's one I learned from my uncles and aunts (all around 70 now...)

I'm in love with the garbage man's daughter (slop slop)
Who lives down by the hill
Oh, she is as sweet as the garbage she eats
Her breath is sweeter still

When we go strolling together (slop slop)
Her slimy hand in mine
Her maggoty head on my shoulders
Oh, this is love divine.