Kenny's lines have been revealed by South Park Studios in the starting music...
In seasons 1-2, he says "I love girls with deep vaginas, I love girls with big fat titties."
In seasons 3-5, he says "I have got a 10-inch penis, use your mouth if you want to clean it."
From season 7 to the first half of season 10, Kenny says "Some day I'll be old enough to stick my dick in Britney's butt."
Here i have upped those 3 lines on audio in da correct order.....lol... da britneys butt 1 is funny...
http://www.speedyshare.com/995209174.html