Title: Terrance and Phillip in Not Without My Anus
Original air date: April 1, 1998

Summary:
"Terrance and Phillip in Not Without My Anus" is the second season premiere of the animated television series South Park, and the 14th overall episode of the series. It originally aired on Comedy Central in the United States on April 1, 1998. The episode follows the two titular characters, a duo of stereotypical Canadians who attempt to save their country from the dictator Saddam Hussein while performing repetitive toilet humour. Unbeknown to them, the plan was partially set up by their rival, a critic who is often displeased by their random jokes of flatulence. The script was written by series co-creators Trey Parker and Matt Stone, along with writer Trisha Nixon.
http://en.wikipedia.org/wiki/List_of_South_Park_episodes