A wise proverb, often linked with wisdom and proverbs. Pronounced ah-yoon-oh, it is often blurted out on most occasions where reality seems ineffable or difficult to describe.
Dude 1: Hey Dude 2!
Dude 2: Hey Dude 1!
Dude 1's head gets lopped off with a chopstick
Dude 2: Ayun o!