Mine is:
Chris Scotch: Butters, I'm just checking up on you... Do I hear television? I said no television while you're grounded!
Cartman(impersonating butters): Ah, gee-whiz dad, I wasn't watching tv, I was just jackin' it.
Chris: J-Jacking what, son?
Cartman: Well, my big hot spicy boner, what...