Yeah, it's funny! I mean, well, they totally stole the fat guy thing from The Simpsons, but it is still funny. Even if it is racist, sexist, vulgar, etc.
It's not funny, seeing as they hardly even use jokes. They just make pop culture references that are misconstrued as funny because people understand them. Also, it's not that risque. Don't think you're hardcore and rebellious for watching it. There is a difference between vulgar and making a fart joke ever 30 seconds.