The portion of a Wikipedia entry above the 'Contents' box.
Bob: What the heck is a 'shaka'?
Joe: I don't know. Did you read the cliff notes?
Bob: Joe, are you high? There's no cliff notes for hand signals.
Joe: I am high, but you can get the cliff notes for anything by reading whatever is above the 'Contents' box for its Wikipedia entry.
Joe: The more you know, Bob. The more you know.