The "Wild Wild West Rap" is a song that Eric Cartman sings near the beginning and end of the episode, "Cat Orgy". The song references the plot of the 1999 film, Wild Wild West, which also had a rap song theme by Will Smith.
Well, I'm a badass Cowboy livin' in the Cowboy days.
Wiggy, wiggy, scratch, yo, yo, bang, bang.
Me and Artemus Clyde frog go save Salma Hayek from the big metal spider.
A wiggy wig wig wiggy wiggy wig
Fresh cowboy from the west side
Wiggy wiggy scratch yo yo bang bang
Me and Artemus Clyde frog go save Salma frog polly prissy pants
Go down to, well... rumpletumpskin