Why was Huggy Wuggy not able to hug Cody’s mom?
Because she was so fat he couldn’t fit his arms around her.
Listen up, buttercup! The joke is that Cody's mom is soooooo fat that Huggy Wuggy can't wrap his arms around her. Get it? It's funny 'cause it makes fun of her size, which is like, super insensitive. You probably need a nap and a juice box after that intellectual workout.