Both from episode 106 "Death"
Ms. Cartman: Eric dear? I just got a call from your friend Kyle's mother. She said that this show is naughty, and might make you a potty mouth.
Cartman: That's a bunch of crap! Kyle's mom is a dirty Jew!
Ms. Cartman: Ohhh, okay hon.
Cartman: I would never kill somebody…not unless the piss me off.
Grampa: Ohh, is that a fact? Well, let me tell you something, Porky. Your mom was over here earlier, and I humped her like a little bitch.
Grampa: That's right.
Grampa: And then, I dug up your great-grandma's skeleton, and had my way with her too.
Grampa: Choice piece of ass, your great-grandma.
Cartman: You piece of crap! I'll kill you!
Grampa: That's the spirit Tubby.
Stan: [restraining Cartman] Come on Cartman, he's just trying to get to you.
Cartman: Don't talk about my mom like that!
Stan: [dragging Cartman away] We can go watch Terrance & Phillip in the kitchen.
Grampa: I ever tell you about the time I boofed your dad, Fatso?
Cartman: Ah, I can't believe that son of a bitch!
Stan: Here Cartman, have some Snacky Cakes.
Cartman: Oooh, Snacky Cakes, god dang.