"Who's Got the Greatest Mom In The World?" is song sung by Eric and Liane Cartman in the Season Ten episode, "Tsst".
Background[]
South Park Elementary school counselor Mr. Mackey calls Liane Cartman into his office because Eric Cartman handcuffed Billy Turner's ankle to the school flagpole, then gave him a hacksaw to free himself. While discussing her son's worsening violent behavior, she begins to cry. Cartman tries to lighten the mood by singing this song.
Lyrics[]
Cartman:
You're a great mom.
Who's got the greatest mom in the world?
I dooo.
My mom is number one in my heart.
It's true!
Mrs. Cartman and Cartman:
My mom's the best mom, better than your mom.
It's singing together in harmony.