Because they felt like it. Also, because its funny.
Fat Guy Strangler
I sure am.
I think it was when Lois became fat and her and peter had fat sex.
fat man
You may be referring to Fish Out of Water
You're a fat, stinking drunk!
Chris Griffin, Louis and Peter's oldest child
season 2, episode 17 - He's Too Sexy for his Fat
It wasn't Streep, it was Cybill Shepherd but the episode is "The Fat Guy Strangler"
You must be thinking of Stewie telling Peter's National Association for the Advancement of Fat People, he'll find their penis for a dollar in Fat Guy Strangler
sparkle is a middle aged fat guy who acts like a child and has a funny voice that sounds funny Just like Peter from Family Guy!
Season 2|Episode 17 He's Too Sexy for His Fat