The way I learned it (at camp I believe) was:
Nobody likes me,
Everybody hates me.
Think I'll eat some worms.
Big, fat, juicy ones,
slip, slop, slimy ones,
fuzzy, wuzzy, little old worms.
First you bite their heads off,
then you suck the guts out.
Then you throw the skins away.
Big, fat, juicy ones,
slip, slop, slimy ones,
Fuzzy, wuzzy, little old worms.