What did Miss Piggy say to her boss when she called in sick? She had a frog in her throat.
Is this a joke about people who are overweight? Or just a random R rated joke?
It's just a throwaway joke, I don't have any problem with fat people.
It's okay to make jokes that are only for adult audiences. Told to the appropriate audience, a joke involving nostalgia and topics that are of adult nature can be amusing.