chuckle about (someone or something)
To laugh about someone or something. I was still chuckling about that scene in the movie the next day. Are you guys chuckling about how I just tripped up the steps?
chuckle about someone or something
and chuckle over someone or somethingto giggle about someone or something. I had to chuckle about Wally and his story about that broken-down old car. We chuckled over how angry Jed was.