When a
baby poops their nappy/diaper.
Fudge =
poop, huggies = nappy/diaper. Used in the Simpsons episode, 'Strong Arms of the Ma.
Bart: '
Ew! Mom, I think Maggie fudged her huggies!'
Marge: 'Bart,
don't say it like that, you'll hurt her feelings. (sniffs) Geez,
Louise! How did you turn cinnamon applesauce into that?!'