some of these i found arent really swears, but they're adult and funny enough to be posted here:
Invader Zim - "Dark Harvest": When Zim is stealing childrens' organs and replacing them with stuff, Dib uses his X-Ray goggles to identify each object, and one girl has a kitten where her reproductive organs should be.
Foster's Home For Imaginary Friends - "Busted": There are multiple jokes about "busts" (refering to the statue kind) in this episode, such as Wilt's "I've never seen such a beautiful bust!" or Bloo's "A bust this big needs ample support!"
Another one from Fosters - "Dinner is Swerved": Bloo gets an idea to tie bedsheets together to make a rope, and he shouts "sheet!". Mac gives him a shocked look, obviously thinking that he said "sh**".
The Fairly OddParents - "Cosmocon": Timmy's dad tells the Britney-Britney band to "hit it!", and Timmy's mom jealously says "He nevers asks me to hit it!".
Fosters again - WILT: No, Eduardo! Reverse the suction!
(Eduardo does so.)
WILT: Oh yeah! Now it's really sucking!
EDUARDO: (Sigh) There's just no pleasing you.
don't get me started with rocko's modern life though....that had some dirty jokes now.
there was a character in the powerpuff girls with the name "dick hardley"
heres a bunch more:
http://www.nohomers.net/showthread.php?t=48328