In the latest promo for Season 7 of "It's Always Sunny in Philadelphia," Danny De Vito asks, "What's so filthy about our show?"

I guess that depends on where you stand on filth, or good, dirty fun, which is exactly what "Sunny" is.

The clip, which is in the player above called "Filthy," then goes on to show all the cast members, Charlie Day, Glenn Howerton, Rob McElhenney and Kaitlin Olson, rattle off words they have uttered on the show: dickwad, douchebag, white stain, assdicks, boners, dickhole.

Day then explains that they were not allowed to use the term "tea-bagging" (even though Republicans seem to be OK with it). "So we had to say balls to the chin, which is much more specific," he says.

The "Season 7" clip shows some moments from the new season, including Dennis and Dee upchucking on a carnival ride, Charlie coaching little girls for a beauty pageant and the most awesome De Vito pratfall ever.

"It's Always Sunny in Philadelphia" returns at 9 p.m. Sept. 15 on FX. Check back in the coming weeks as I will have more from my chats with the "Sunny" cast at San Diego Comic-Con.