Who said "Strength is knowing when to stab someone in the back."?

This quote is attributed to Cartman.

Strength is knowing when to stab someone in the back. - Cartman

"Strength is knowing when to stab someone in the back."

Cartman Strength

"Screw you guys, I'm going home!"

"I'm not fat, I'm just big-boned!"

"You will respect my authority!"

"Hippies, they're everywhere!"

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."