Who said "Keep it real, man, that's all that matters."?

This quote is attributed to Bart Simpson.

Keep it real, man, that's all that matters. - Bart Simpson

"Keep it real, man, that's all that matters."

Bart Simpson Truth

"Eat my shorts!"

"Ay caramba!"

"Don't have a cow, man."

"Cowabunga!"

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."