Who said "That's sick, dude!"?

This quote is attributed to Kenny McCormick.

That's sick, dude! - Kenny McCormick

"That's sick, dude!"

Kenny McCormick Humor

"Mmph mmph mrmph!"

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

"Dude, we're in third grade"

"This is so cool"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."