Bulletstorm, released in February, is probably still 2011's most foul-mouthed game. It may be 2012's most foul-mouthed game, too. It popularized the term "dicktits" after all.
I don't know how you should feel about seeing Epic Games president Mike Capps in the shower. I'm still trying to figure out how I should feel about a game that urges me to preorder by calling me "dick tits."
If your sensibilities can tolerate the incineration and impaling of pus-oozing space zombies, but not the profligate use of cuss words, then Bulletstorm is your game. The raucous shooter will feature an option to tone down its notoriously salty language.